18936953644 has 96 divisors (see below), whose sum is σ = 39260712960. Its totient is φ = 7825484352.

The previous prime is 18936953621. The next prime is 18936953671. The reversal of 18936953644 is 44635963981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22897959 + ... + 22898785.

It is an arithmetic number, because the mean of its divisors is an integer number (408965760).

Almost surely, 2^18936953644 is an apocalyptic number.

18936953644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18936953644 is an abundant number, since it is smaller than the sum of its proper divisors (20323759316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18936953644 is a wasteful number, since it uses less digits than its factorization.

18936953644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147 (or 1145 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 58.

The spelling of 18936953644 in words is "eighteen billion, nine hundred thirty-six million, nine hundred fifty-three thousand, six hundred forty-four".