18954045981 has 64 divisors (see below), whose sum is σ = 31780573440. Its totient is φ = 11084532480.

The previous prime is 18954045967. The next prime is 18954046117.

18954045981 is a `hidden beast` number, since 1 + 8 + 9 + 5 + 40 + 4 + 598 + 1 = 666.

18954045981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18954045981 - 2⁵ = 18954045949 is a prime.

It is a super-2 number, since 2×18954045981² (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 (18954045941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 541471 + ... + 575411.

It is an arithmetic number, because the mean of its divisors is an integer number (496571460).

Almost surely, 2^18954045981 is an apocalyptic number.

It is an amenable number.

18954045981 is a deficient number, since it is larger than the sum of its proper divisors (12826527459).

18954045981 is a wasteful number, since it uses less digits than its factorization.

18954045981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34043 (or 34037 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 18954045981 in words is "eighteen billion, nine hundred fifty-four million, forty-five thousand, nine hundred eighty-one".