18918946776 has 16 divisors (see below), whose sum is σ = 47297367000. Its totient is φ = 6306315584.

The previous prime is 18918946759. The next prime is 18918946777. The reversal of 18918946776 is 67764981981.

It is a happy number.

It is a super-2 number, since 2×18918946776² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918946777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394144701 + ... + 394144748.

Almost surely, 2^18918946776 is an apocalyptic number.

It is an amenable number.

18918946776 is an abundant number, since it is smaller than the sum of its proper divisors (28378420224).

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

18918946776 is a wasteful number, since it uses less digits than its factorization.

18918946776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788289458 (or 788289454 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 66.

The spelling of 18918946776 in words is "eighteen billion, nine hundred eighteen million, nine hundred forty-six thousand, seven hundred seventy-six".