77559771381 has 32 divisors (see below), whose sum is σ = 112506662016. Its totient is φ = 47334144000.

The previous prime is 77559771361. The next prime is 77559771397. The reversal of 77559771381 is 18317795577.

It is not a de Polignac number, because 77559771381 - 2¹⁴ = 77559754997 is a prime.

It is a super-2 number, since 2×77559771381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77559771361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636091 + ... + 748151.

It is an arithmetic number, because the mean of its divisors is an integer number (3515833188).

Almost surely, 2^77559771381 is an apocalyptic number.

It is an amenable number.

77559771381 is a deficient number, since it is larger than the sum of its proper divisors (34946890635).

77559771381 is a wasteful number, since it uses less digits than its factorization.

77559771381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112453.

The product of its digits is 12965400, while the sum is 60.

The spelling of 77559771381 in words is "seventy-seven billion, five hundred fifty-nine million, seven hundred seventy-one thousand, three hundred eighty-one".