121577777672 has 32 divisors (see below), whose sum is σ = 247426636800. Its totient is φ = 55670981184.

The previous prime is 121577777639. The next prime is 121577777683. The reversal of 121577777672 is 276777775121.

It is a happy number.

121577777672 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 4589222 + ... + 4615637.

It is an arithmetic number, because the mean of its divisors is an integer number (7732082400).

Almost surely, 2^121577777672 is an apocalyptic number.

It is an amenable number.

121577777672 is an abundant number, since it is smaller than the sum of its proper divisors (125848859128).

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

121577777672 is a wasteful number, since it uses less digits than its factorization.

121577777672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9205005 (or 9205001 counting only the distinct ones).

The product of its digits is 14117880, while the sum is 59.

The spelling of 121577777672 in words is "one hundred twenty-one billion, five hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred seventy-two".