123640143017782 has 16 divisors (see below), whose sum is σ = 185479408230480. Its totient is φ = 61813673970048.

The previous prime is 123640143017767. The next prime is 123640143017803. The reversal of 123640143017782 is 287710341046321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894972469 + ... + 895110607.

It is an arithmetic number, because the mean of its divisors is an integer number (11592463014405).

Almost surely, 2^{123640143017782} is an apocalyptic number.

123640143017782 is a deficient number, since it is larger than the sum of its proper divisors (61839265212698).

123640143017782 is a wasteful number, since it uses less digits than its factorization.

123640143017782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181215.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 123640143017782 in words is "one hundred twenty-three trillion, six hundred forty billion, one hundred forty-three million, seventeen thousand, seven hundred eighty-two".