102639499877 has 4 divisors (see below), whose sum is σ = 102640807500. Its totient is φ = 102638192256.

The previous prime is 102639499847. The next prime is 102639499883. The reversal of 102639499877 is 778994936201.

It is a Cunningham number, because it is equal to 320374²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 778994936201 = 43 ⋅18116161307.

It can be written as a sum of positive squares in 2 ways, for example, as 8904941956 + 93734557921 = 94366^2 + 306161^2 .

It is a cyclic number.

It is not a de Polignac number, because 102639499877 - 2¹⁸ = 102639237733 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 (102639499847) 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, 528002 + ... + 695747.

It is an arithmetic number, because the mean of its divisors is an integer number (25660201875).

Almost surely, 2^102639499877 is an apocalyptic number.

It is an amenable number.

102639499877 is a deficient number, since it is larger than the sum of its proper divisors (1307623).

102639499877 is an equidigital number, since it uses as much as digits as its factorization.

102639499877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307622.

The product of its (nonzero) digits is 41150592, while the sum is 65.

The spelling of 102639499877 in words is "one hundred two billion, six hundred thirty-nine million, four hundred ninety-nine thousand, eight hundred seventy-seven".