77533712216 has 8 divisors (see below), whose sum is σ = 145375710420. Its totient is φ = 38766856104.

The previous prime is 77533712173. The next prime is 77533712233. The reversal of 77533712216 is 61221733577.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×77533712216² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4845857006 + ... + 4845857021.

Almost surely, 2^77533712216 is an apocalyptic number.

It is an amenable number.

77533712216 is a deficient number, since it is larger than the sum of its proper divisors (67841998204).

77533712216 is a wasteful number, since it uses less digits than its factorization.

77533712216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9691714033 (or 9691714029 counting only the distinct ones).

The product of its digits is 370440, while the sum is 44.

The spelling of 77533712216 in words is "seventy-seven billion, five hundred thirty-three million, seven hundred twelve thousand, two hundred sixteen".