1265403363840 has 1440 divisors, whose sum is σ = 5600737029888. Its totient is φ = 258387148800.

The previous prime is 1265403363769. The next prime is 1265403363911. The reversal of 1265403363840 is 483633045621.

1265403363840 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 4 + 0 + 3 + 3 + 638 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1265403363769) and next prime (1265403363911).

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1190407149 + ... + 1190408211.

Almost surely, 2^{1265403363840} is an apocalyptic number.

1265403363840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265403363840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2800368514944).

1265403363840 is an abundant number, since it is smaller than the sum of its proper divisors (4335333666048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265403363840 is a wasteful number, since it uses less digits than its factorization.

1265403363840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 1265403363840 in words is "one trillion, two hundred sixty-five billion, four hundred three million, three hundred sixty-three thousand, eight hundred forty".