1265655553600 has 42 divisors (see below), whose sum is σ = 3114303700514. Its totient is φ = 506262220800.

The previous prime is 1265655553559. The next prime is 1265655553601. The reversal of 1265655553600 is 63555565621.

It can be written as a sum of positive squares in 3 ways, for example, as 8243187264 + 1257412366336 = 90792^2 + 1121344^2 .

It is not an unprimeable number, because it can be changed into a prime (1265655553601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395515761 + ... + 395518960.

Almost surely, 2^{1265655553600} is an apocalyptic number.

1265655553600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265655553600 is an abundant number, since it is smaller than the sum of its proper divisors (1848648146914).

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

1265655553600 is an equidigital number, since it uses as much as digits as its factorization.

1265655553600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791034743 (or 791034728 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 1265655553600 in words is "one trillion, two hundred sixty-five billion, six hundred fifty-five million, five hundred fifty-three thousand, six hundred".