18701572540 has 48 divisors (see below), whose sum is σ = 45295588800. Its totient is φ = 6353137152.

The previous prime is 18701572537. The next prime is 18701572543. The reversal of 18701572540 is 4527510781.

It is an interprime number because it is at equal distance from previous prime (18701572537) and next prime (18701572543).

It is a junction number, because it is equal to n+sod(n) for n = 18701572493 and 18701572502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701572543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597505 + ... + 628024.

It is an arithmetic number, because the mean of its divisors is an integer number (943658100).

Almost surely, 2^18701572540 is an apocalyptic number.

18701572540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18701572540 is an abundant number, since it is smaller than the sum of its proper divisors (26594016260).

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

18701572540 is a wasteful number, since it uses less digits than its factorization.

18701572540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225654 (or 1225652 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 40.

The spelling of 18701572540 in words is "eighteen billion, seven hundred one million, five hundred seventy-two thousand, five hundred forty".