77922463681 has 4 divisors (see below), whose sum is σ = 82023646000. Its totient is φ = 73821281364.

The previous prime is 77922463679. The next prime is 77922463739. The reversal of 77922463681 is 18636422977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77922463681 - 2¹ = 77922463679 is a prime.

It is a super-2 number, since 2×77922463681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77922463651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050591131 + ... + 2050591168.

It is an arithmetic number, because the mean of its divisors is an integer number (20505911500).

Almost surely, 2^77922463681 is an apocalyptic number.

It is an amenable number.

77922463681 is a deficient number, since it is larger than the sum of its proper divisors (4101182319).

77922463681 is a wasteful number, since it uses less digits than its factorization.

77922463681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101182318.

The product of its digits is 6096384, while the sum is 55.

The spelling of 77922463681 in words is "seventy-seven billion, nine hundred twenty-two million, four hundred sixty-three thousand, six hundred eighty-one".