102140871779 has 4 divisors (see below), whose sum is σ = 103371484776. Its totient is φ = 100910258784.

The previous prime is 102140871751. The next prime is 102140871793. The reversal of 102140871779 is 977178041201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102140871779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102140871179) 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, 615306374 + ... + 615306539.

It is an arithmetic number, because the mean of its divisors is an integer number (25842871194).

Almost surely, 2^102140871779 is an apocalyptic number.

102140871779 is a deficient number, since it is larger than the sum of its proper divisors (1230612997).

102140871779 is an equidigital number, since it uses as much as digits as its factorization.

102140871779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230612996.

The product of its (nonzero) digits is 197568, while the sum is 47.

The spelling of 102140871779 in words is "one hundred two billion, one hundred forty million, eight hundred seventy-one thousand, seven hundred seventy-nine".