121577520666 has 32 divisors (see below), whose sum is σ = 281805447168. Its totient is φ = 34247188080.

The previous prime is 121577520653. The next prime is 121577520667. The reversal of 121577520666 is 666025775121.

It is not an unprimeable number, because it can be changed into a prime (121577520667) 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, 20382250 + ... + 20388213.

It is an arithmetic number, because the mean of its divisors is an integer number (8806420224).

Almost surely, 2^121577520666 is an apocalyptic number.

121577520666 is an abundant number, since it is smaller than the sum of its proper divisors (160227926502).

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

121577520666 is a wasteful number, since it uses less digits than its factorization.

121577520666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40770546.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 121577520666 in words is "one hundred twenty-one billion, five hundred seventy-seven million, five hundred twenty thousand, six hundred sixty-six".