77561521260605 has 16 divisors (see below), whose sum is σ = 94036337923584. Its totient is φ = 61407582727680.

The previous prime is 77561521260593. The next prime is 77561521260697. The reversal of 77561521260605 is 50606212516577.

It is a happy number.

It is not a de Polignac number, because 77561521260605 - 2²⁴ = 77561504483389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12831200 + ... + 17881910.

It is an arithmetic number, because the mean of its divisors is an integer number (5877271120224).

Almost surely, 2^{77561521260605} is an apocalyptic number.

It is an amenable number.

77561521260605 is a deficient number, since it is larger than the sum of its proper divisors (16474816662979).

77561521260605 is a wasteful number, since it uses less digits than its factorization.

77561521260605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082476.

The product of its (nonzero) digits is 5292000, while the sum is 53.

The spelling of 77561521260605 in words is "seventy-seven trillion, five hundred sixty-one billion, five hundred twenty-one million, two hundred sixty thousand, six hundred five".