121666072715 has 32 divisors (see below), whose sum is σ = 162988416000. Its totient is φ = 86427302400.

The previous prime is 121666072669. The next prime is 121666072739. The reversal of 121666072715 is 517270666121.

It is not a de Polignac number, because 121666072715 - 2¹⁸ = 121665810571 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1242755 + ... + 1337075.

It is an arithmetic number, because the mean of its divisors is an integer number (5093388000).

Almost surely, 2^121666072715 is an apocalyptic number.

121666072715 is a deficient number, since it is larger than the sum of its proper divisors (41322343285).

121666072715 is a wasteful number, since it uses less digits than its factorization.

121666072715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94883.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 121666072715 in words is "one hundred twenty-one billion, six hundred sixty-six million, seventy-two thousand, seven hundred fifteen".