123665665297690 has 32 divisors (see below), whose sum is σ = 223327021002624. Its totient is φ = 49304310759360.

The previous prime is 123665665297549. The next prime is 123665665297697. The reversal of 123665665297690 is 96792566566321.

123665665297690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×123665665297690² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123665665297697) 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 15 ways as a sum of consecutive naturals, for example, 202428595 + ... + 203038585.

It is an arithmetic number, because the mean of its divisors is an integer number (6978969406332).

Almost surely, 2^{123665665297690} is an apocalyptic number.

123665665297690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123665665297690 is a deficient number, since it is larger than the sum of its proper divisors (99661355704934).

123665665297690 is a wasteful number, since it uses less digits than its factorization.

123665665297690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676342.

The product of its (nonzero) digits is 1322697600, while the sum is 73.

The spelling of 123665665297690 in words is "one hundred twenty-three trillion, six hundred sixty-five billion, six hundred sixty-five million, two hundred ninety-seven thousand, six hundred ninety".