77121515106 has 24 divisors (see below), whose sum is σ = 167971474944. Its totient is φ = 25572578040.

The previous prime is 77121515077. The next prime is 77121515143. The reversal of 77121515106 is 60151512177.

It is a happy number.

77121515106 is a `hidden beast` number, since 7 + 7 + 121 + 515 + 10 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11212606 + ... + 11219481.

It is an arithmetic number, because the mean of its divisors is an integer number (6998811456).

Almost surely, 2^77121515106 is an apocalyptic number.

77121515106 is an abundant number, since it is smaller than the sum of its proper divisors (90849959838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77121515106 is a wasteful number, since it uses less digits than its factorization.

77121515106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22432286 (or 22432283 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 36.

The spelling of 77121515106 in words is "seventy-seven billion, one hundred twenty-one million, five hundred fifteen thousand, one hundred six".