18691464957 has 24 divisors (see below), whose sum is σ = 27403192320. Its totient is φ = 11324174400.

The previous prime is 18691464941. The next prime is 18691465081. The reversal of 18691464957 is 75946419681.

It is not a de Polignac number, because 18691464957 - 2⁴ = 18691464941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18691464957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18691464557) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1273732 + ... + 1288322.

It is an arithmetic number, because the mean of its divisors is an integer number (1141799680).

Almost surely, 2^18691464957 is an apocalyptic number.

It is an amenable number.

18691464957 is a deficient number, since it is larger than the sum of its proper divisors (8711727363).

18691464957 is a wasteful number, since it uses less digits than its factorization.

18691464957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18145 (or 18134 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The spelling of 18691464957 in words is "eighteen billion, six hundred ninety-one million, four hundred sixty-four thousand, nine hundred fifty-seven".