18949567540 has 24 divisors (see below), whose sum is σ = 41888518560. Its totient is φ = 7180888608.

The previous prime is 18949567537. The next prime is 18949567577. The reversal of 18949567540 is 4576594981.

It is a super-2 number, since 2×18949567540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24933262 + ... + 24934021.

It is an arithmetic number, because the mean of its divisors is an integer number (1745354940).

Almost surely, 2^18949567540 is an apocalyptic number.

18949567540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18949567540 is an abundant number, since it is smaller than the sum of its proper divisors (22938951020).

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

18949567540 is a wasteful number, since it uses less digits than its factorization.

18949567540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49867311 (or 49867309 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 18949567540 in words is "eighteen billion, nine hundred forty-nine million, five hundred sixty-seven thousand, five hundred forty".