260940286521 has 6 divisors (see below), whose sum is σ = 376913747210. Its totient is φ = 173960191008.

The previous prime is 260940286517. The next prime is 260940286531. The reversal of 260940286521 is 125682049062.

260940286521 is a `hidden beast` number, since 2 + 6 + 0 + 9 + 40 + 2 + 86 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 153789465600 + 107150820921 = 392160^2 + 327339^2 .

It is not a de Polignac number, because 260940286521 - 2² = 260940286517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (260940286531) 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, 14496682576 + ... + 14496682593.

Almost surely, 2^260940286521 is an apocalyptic number.

It is an amenable number.

260940286521 is a deficient number, since it is larger than the sum of its proper divisors (115973460689).

260940286521 is a wasteful number, since it uses less digits than its factorization.

260940286521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28993365175 (or 28993365172 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 260940286521 in words is "two hundred sixty billion, nine hundred forty million, two hundred eighty-six thousand, five hundred twenty-one".