18212864857949 has 16 divisors (see below), whose sum is σ = 18535495680000. Its totient is φ = 17890703030640.

The previous prime is 18212864857919. The next prime is 18212864857961. The reversal of 18212864857949 is 94975846821281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18212864857949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212864857919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595974932 + ... + 596005490.

It is an arithmetic number, because the mean of its divisors is an integer number (1158468480000).

Almost surely, 2^{18212864857949} is an apocalyptic number.

It is an amenable number.

18212864857949 is a deficient number, since it is larger than the sum of its proper divisors (322630822051).

18212864857949 is a wasteful number, since it uses less digits than its factorization.

18212864857949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37888.

The product of its digits is 557383680, while the sum is 74.

The spelling of 18212864857949 in words is "eighteen trillion, two hundred twelve billion, eight hundred sixty-four million, eight hundred fifty-seven thousand, nine hundred forty-nine".