77121515105 has 8 divisors (see below), whose sum is σ = 92616633792. Its totient is φ = 61650001648.

The previous prime is 77121515077. The next prime is 77121515143. The reversal of 77121515105 is 50151512177.

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

It is a cyclic number.

It is not a de Polignac number, because 77121515105 - 2¹⁴ = 77121498721 is a prime.

It is a super-2 number, since 2×77121515105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian 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, 5894117 + ... + 5907186.

It is an arithmetic number, because the mean of its divisors is an integer number (11577079224).

Almost surely, 2^77121515105 is an apocalyptic number.

It is an amenable number.

77121515105 is a deficient number, since it is larger than the sum of its proper divisors (15495118687).

77121515105 is a wasteful number, since it uses less digits than its factorization.

77121515105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11802615.

The product of its (nonzero) digits is 12250, while the sum is 35.

The spelling of 77121515105 in words is "seventy-seven billion, one hundred twenty-one million, five hundred fifteen thousand, one hundred five".