16620537648 has 80 divisors (see below), whose sum is σ = 50442771456. Its totient is φ = 4649099520.

The previous prime is 16620537631. The next prime is 16620537649. The reversal of 16620537648 is 84673502661.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 16620537597 and 16620537606.

It is not an unprimeable number, because it can be changed into a prime (16620537649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1203840 + ... + 1217567.

Almost surely, 2^16620537648 is an apocalyptic number.

It is an amenable number.

16620537648 is an abundant number, since it is smaller than the sum of its proper divisors (33822233808).

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

16620537648 is a wasteful number, since it uses less digits than its factorization.

16620537648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421442 (or 2421436 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 16620537648 in words is "sixteen billion, six hundred twenty million, five hundred thirty-seven thousand, six hundred forty-eight".