77942942215 has 8 divisors (see below), whose sum is σ = 93809074320. Its totient is φ = 62169324672.

The previous prime is 77942942191. The next prime is 77942942281. The reversal of 77942942215 is 51224924977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77942942215 is a prime.

It is a super-2 number, since 2×77942942215² (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 in 7 ways as a sum of consecutive naturals, for example, 23126785 + ... + 23130154.

It is an arithmetic number, because the mean of its divisors is an integer number (11726134290).

Almost surely, 2^77942942215 is an apocalyptic number.

77942942215 is a deficient number, since it is larger than the sum of its proper divisors (15866132105).

77942942215 is a wasteful number, since it uses less digits than its factorization.

77942942215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46257281.

The product of its digits is 2540160, while the sum is 52.

The spelling of 77942942215 in words is "seventy-seven billion, nine hundred forty-two million, nine hundred forty-two thousand, two hundred fifteen".