121556657602 has 8 divisors (see below), whose sum is σ = 186575335056. Its totient is φ = 59364879252.

The previous prime is 121556657567. The next prime is 121556657617. The reversal of 121556657602 is 206756655121.

121556657602 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706724668 + ... + 706724839.

It is an arithmetic number, because the mean of its divisors is an integer number (23321916882).

Almost surely, 2^121556657602 is an apocalyptic number.

121556657602 is a deficient number, since it is larger than the sum of its proper divisors (65018677454).

121556657602 is a wasteful number, since it uses less digits than its factorization.

121556657602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413449552.

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 121556657602 in words is "one hundred twenty-one billion, five hundred fifty-six million, six hundred fifty-seven thousand, six hundred two".