102605579999 has 4 divisors (see below), whose sum is σ = 110498316936. Its totient is φ = 94712843064.

The previous prime is 102605579987. The next prime is 102605580013. The reversal of 102605579999 is 999975506201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102605579999 - 2⁸ = 102605579743 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 (102605579299) 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, 3946368449 + ... + 3946368474.

It is an arithmetic number, because the mean of its divisors is an integer number (27624579234).

Almost surely, 2^102605579999 is an apocalyptic number.

102605579999 is a deficient number, since it is larger than the sum of its proper divisors (7892736937).

102605579999 is an equidigital number, since it uses as much as digits as its factorization.

102605579999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7892736936.

The product of its (nonzero) digits is 13778100, while the sum is 62.

The spelling of 102605579999 in words is "one hundred two billion, six hundred five million, five hundred seventy-nine thousand, nine hundred ninety-nine".