18765665740 has 24 divisors (see below), whose sum is σ = 39410536032. Its totient is φ = 7505763840.

The previous prime is 18765665731. The next prime is 18765665749. The reversal of 18765665740 is 4756656781.

It is an interprime number because it is at equal distance from previous prime (18765665731) and next prime (18765665749).

It is not an unprimeable number, because it can be changed into a prime (18765665749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470457 + ... + 508783.

It is an arithmetic number, because the mean of its divisors is an integer number (1642105668).

Almost surely, 2^18765665740 is an apocalyptic number.

18765665740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18765665740 is an abundant number, since it is smaller than the sum of its proper divisors (20644870292).

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

18765665740 is a wasteful number, since it uses less digits than its factorization.

18765665740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62817 (or 62815 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 18765665740 in words is "eighteen billion, seven hundred sixty-five million, six hundred sixty-five thousand, seven hundred forty".