18239735257478 has 16 divisors (see below), whose sum is σ = 31360901324064. Its totient is φ = 7793833461120.

The previous prime is 18239735257459. The next prime is 18239735257547. The reversal of 18239735257478 is 87475253793281.

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, 1932989693 + ... + 1932999128.

It is an arithmetic number, because the mean of its divisors is an integer number (1960056332754).

Almost surely, 2^{18239735257478} is an apocalyptic number.

18239735257478 is a deficient number, since it is larger than the sum of its proper divisors (13121166066586).

18239735257478 is a wasteful number, since it uses less digits than its factorization.

18239735257478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865989167.

The product of its digits is 711244800, while the sum is 71.

The spelling of 18239735257478 in words is "eighteen trillion, two hundred thirty-nine billion, seven hundred thirty-five million, two hundred fifty-seven thousand, four hundred seventy-eight".