1260267256521 has 72 divisors (see below), whose sum is σ = 2284849432320. Its totient is φ = 663483731904.

The previous prime is 1260267256483. The next prime is 1260267256579. The reversal of 1260267256521 is 1256527620621.

1260267256521 is a `hidden beast` number, since 1 + 2 + 6 + 0 + 2 + 6 + 72 + 56 + 521 = 666.

It is not a de Polignac number, because 1260267256521 - 2¹⁵ = 1260267223753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1260267252521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2788200 + ... + 3208518.

Almost surely, 2^{1260267256521} is an apocalyptic number.

It is an amenable number.

1260267256521 is a deficient number, since it is larger than the sum of its proper divisors (1024582175799).

1260267256521 is a wasteful number, since it uses less digits than its factorization.

1260267256521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420875 (or 420865 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 1260267256521 in words is "one trillion, two hundred sixty billion, two hundred sixty-seven million, two hundred fifty-six thousand, five hundred twenty-one".