102123657817 has 4 divisors (see below), whose sum is σ = 102903227856. Its totient is φ = 101344087780.

The previous prime is 102123657773. The next prime is 102123657877. The reversal of 102123657817 is 718756321201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102123657817 - 2¹⁵ = 102123625049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102123657877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389784823 + ... + 389785084.

It is an arithmetic number, because the mean of its divisors is an integer number (25725806964).

Almost surely, 2^102123657817 is an apocalyptic number.

It is an amenable number.

102123657817 is a deficient number, since it is larger than the sum of its proper divisors (779570039).

102123657817 is an equidigital number, since it uses as much as digits as its factorization.

102123657817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779570038.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 102123657817 in words is "one hundred two billion, one hundred twenty-three million, six hundred fifty-seven thousand, eight hundred seventeen".