16640248557 has 4 divisors (see below), whose sum is σ = 22186998080. Its totient is φ = 11093499036.

The previous prime is 16640248553. The next prime is 16640248577. The reversal of 16640248557 is 75584204661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16640248557 - 2² = 16640248553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640248553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2773374757 + ... + 2773374762.

It is an arithmetic number, because the mean of its divisors is an integer number (5546749520).

Almost surely, 2^16640248557 is an apocalyptic number.

It is an amenable number.

16640248557 is a deficient number, since it is larger than the sum of its proper divisors (5546749523).

16640248557 is an equidigital number, since it uses as much as digits as its factorization.

16640248557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546749522.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 16640248557 in words is "sixteen billion, six hundred forty million, two hundred forty-eight thousand, five hundred fifty-seven".