123621565166 has 32 divisors (see below), whose sum is σ = 208614722400. Its totient is φ = 54453107200.

The previous prime is 123621565079. The next prime is 123621565169. The reversal of 123621565166 is 661565126321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123621565169) 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, 325511 + ... + 594306.

It is an arithmetic number, because the mean of its divisors is an integer number (6519210075).

Almost surely, 2^123621565166 is an apocalyptic number.

123621565166 is a deficient number, since it is larger than the sum of its proper divisors (84993157234).

123621565166 is a wasteful number, since it uses less digits than its factorization.

123621565166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920020.

The product of its digits is 388800, while the sum is 44.

The spelling of 123621565166 in words is "one hundred twenty-three billion, six hundred twenty-one million, five hundred sixty-five thousand, one hundred sixty-six".