121640645223 has 6 divisors (see below), whose sum is σ = 175703154224. Its totient is φ = 81093763476.

The previous prime is 121640645213. The next prime is 121640645249. The reversal of 121640645223 is 322546046121.

121640645223 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 4 + 0 + 645 + 2 + 2 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-121640645223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121640645213) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6757813615 + ... + 6757813632.

Almost surely, 2^121640645223 is an apocalyptic number.

121640645223 is a deficient number, since it is larger than the sum of its proper divisors (54062509001).

121640645223 is a wasteful number, since it uses less digits than its factorization.

121640645223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13515627253 (or 13515627250 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 121640645223 in words is "one hundred twenty-one billion, six hundred forty million, six hundred forty-five thousand, two hundred twenty-three".