123172020815 has 8 divisors (see below), whose sum is σ = 148079637888. Its totient is φ = 98355474720.

The previous prime is 123172020799. The next prime is 123172020817. The reversal of 123172020815 is 518020271321.

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

It is not a de Polignac number, because 123172020815 - 2⁴ = 123172020799 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 (123172020817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22764767 + ... + 22770176.

It is an arithmetic number, because the mean of its divisors is an integer number (18509954736).

Almost surely, 2^123172020815 is an apocalyptic number.

123172020815 is a deficient number, since it is larger than the sum of its proper divisors (24907617073).

123172020815 is an equidigital number, since it uses as much as digits as its factorization.

123172020815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45535489.

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 123172020815 in words is "one hundred twenty-three billion, one hundred seventy-two million, twenty thousand, eight hundred fifteen".