77043747081 has 12 divisors (see below), whose sum is σ = 119496424272. Its totient is φ = 44024998248.

The previous prime is 77043747071. The next prime is 77043747113. The reversal of 77043747081 is 18074734077.

It is a happy number.

It is not a de Polignac number, because 77043747081 - 2⁵ = 77043747049 is a prime.

It is a super-2 number, since 2×77043747081² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77043747081.

It is not an unprimeable number, because it can be changed into a prime (77043747061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262053415 + ... + 262053708.

It is an arithmetic number, because the mean of its divisors is an integer number (9958035356).

Almost surely, 2^77043747081 is an apocalyptic number.

It is an amenable number.

77043747081 is a deficient number, since it is larger than the sum of its proper divisors (42452677191).

77043747081 is a wasteful number, since it uses less digits than its factorization.

77043747081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524107140 (or 524107133 counting only the distinct ones).

The product of its (nonzero) digits is 921984, while the sum is 48.

The spelling of 77043747081 in words is "seventy-seven billion, forty-three million, seven hundred forty-seven thousand, eighty-one".