121777127767506 has 32 divisors (see below), whose sum is σ = 254147076425088. Its totient is φ = 38826954460800.

The previous prime is 121777127767439. The next prime is 121777127767553. The reversal of 121777127767506 is 605767721777121.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4015956 + ... + 16114656.

It is an arithmetic number, because the mean of its divisors is an integer number (7942096138284).

Almost surely, 2^{121777127767506} is an apocalyptic number.

121777127767506 is an abundant number, since it is smaller than the sum of its proper divisors (132369948657582).

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

121777127767506 is a wasteful number, since it uses less digits than its factorization.

121777127767506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12171666.

The product of its (nonzero) digits is 84707280, while the sum is 66.

The spelling of 121777127767506 in words is "one hundred twenty-one trillion, seven hundred seventy-seven billion, one hundred twenty-seven million, seven hundred sixty-seven thousand, five hundred six".