78155077834 has 8 divisors (see below), whose sum is σ = 117254557728. Its totient is φ = 39070225260.

The previous prime is 78155077787. The next prime is 78155077919. The reversal of 78155077834 is 43877055187.

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

It is a super-2 number, since 2×78155077834² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3643462 + ... + 3664849.

It is an arithmetic number, because the mean of its divisors is an integer number (14656819716).

Almost surely, 2^78155077834 is an apocalyptic number.

78155077834 is a deficient number, since it is larger than the sum of its proper divisors (39099479894).

78155077834 is a wasteful number, since it uses less digits than its factorization.

78155077834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7313660.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 78155077834 in words is "seventy-eight billion, one hundred fifty-five million, seventy-seven thousand, eight hundred thirty-four".