102123657815 has 4 divisors (see below), whose sum is σ = 122548389384. Its totient is φ = 81698926248.

The previous prime is 102123657773. The next prime is 102123657877. The reversal of 102123657815 is 518756321201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518756321201 = 53 ⋅9787855117.

It is a cyclic number.

It is not a de Polignac number, because 102123657815 - 2¹⁶ = 102123592279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10212365777 + ... + 10212365786.

It is an arithmetic number, because the mean of its divisors is an integer number (30637097346).

Almost surely, 2^102123657815 is an apocalyptic number.

102123657815 is a deficient number, since it is larger than the sum of its proper divisors (20424731569).

102123657815 is an equidigital number, since it uses as much as digits as its factorization.

102123657815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20424731568.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 102123657815 in words is "one hundred two billion, one hundred twenty-three million, six hundred fifty-seven thousand, eight hundred fifteen".