77121515097 has 16 divisors (see below), whose sum is σ = 124640832960. Its totient is φ = 46740312000.

The previous prime is 77121515077. The next prime is 77121515143. The reversal of 77121515097 is 79051512177.

77121515097 is a `hidden beast` number, since 7 + 7 + 121 + 515 + 0 + 9 + 7 = 666.

It is not a de Polignac number, because 77121515097 - 2¹⁸ = 77121252953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77121515077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129833904 + ... + 129834497.

It is an arithmetic number, because the mean of its divisors is an integer number (7790052060).

Almost surely, 2^77121515097 is an apocalyptic number.

It is an amenable number.

77121515097 is a deficient number, since it is larger than the sum of its proper divisors (47519317863).

77121515097 is a wasteful number, since it uses less digits than its factorization.

77121515097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259668421 (or 259668415 counting only the distinct ones).

The product of its (nonzero) digits is 154350, while the sum is 45.

The spelling of 77121515097 in words is "seventy-seven billion, one hundred twenty-one million, five hundred fifteen thousand, ninety-seven".