121765400164 has 12 divisors (see below), whose sum is σ = 213534316800. Its totient is φ = 60755595368.

The previous prime is 121765400069. The next prime is 121765400173. The reversal of 121765400164 is 461004567121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31774024 + ... + 31777855.

It is an arithmetic number, because the mean of its divisors is an integer number (17794526400).

Almost surely, 2^121765400164 is an apocalyptic number.

It is an amenable number.

121765400164 is a deficient number, since it is larger than the sum of its proper divisors (91768916636).

121765400164 is a wasteful number, since it uses less digits than its factorization.

121765400164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63552362 (or 63552360 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 121765400164 its reverse (461004567121), we get a palindrome (582769967285).

The spelling of 121765400164 in words is "one hundred twenty-one billion, seven hundred sixty-five million, four hundred thousand, one hundred sixty-four".