18157457640 has 768 divisors, whose sum is σ = 70349783040. Its totient is φ = 3725568000.

The previous prime is 18157457629. The next prime is 18157457653. The reversal of 18157457640 is 4675475181.

It is a self number, because there is not a number n which added to its sum of digits gives 18157457640.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 255738805 + ... + 255738875.

It is an arithmetic number, because the mean of its divisors is an integer number (91601280).

Almost surely, 2^18157457640 is an apocalyptic number.

18157457640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18157457640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35174891520).

18157457640 is an abundant number, since it is smaller than the sum of its proper divisors (52192325400).

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

18157457640 is a wasteful number, since it uses less digits than its factorization.

18157457640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 18157457640 in words is "eighteen billion, one hundred fifty-seven million, four hundred fifty-seven thousand, six hundred forty".