1263261154320 has 800 divisors, whose sum is σ = 4934487672576. Its totient is φ = 296831692800.

The previous prime is 1263261154247. The next prime is 1263261154333. The reversal of 1263261154320 is 234511623621.

1263261154320 is a `hidden beast` number, since 1 + 2 + 6 + 3 + 2 + 611 + 5 + 4 + 32 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 836042365 + ... + 836043875.

Almost surely, 2^{1263261154320} is an apocalyptic number.

1263261154320 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 1263261154320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2467243836288).

1263261154320 is an abundant number, since it is smaller than the sum of its proper divisors (3671226518256).

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

1263261154320 is a wasteful number, since it uses less digits than its factorization.

1263261154320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 1263261154320 its reverse (234511623621), we get a palindrome (1497772777941).

The spelling of 1263261154320 in words is "one trillion, two hundred sixty-three billion, two hundred sixty-one million, one hundred fifty-four thousand, three hundred twenty".