16557377007 has 4 divisors (see below), whose sum is σ = 22076502680. Its totient is φ = 11038251336.

The previous prime is 16557376993. The next prime is 16557377033. The reversal of 16557377007 is 70077375561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70077375561 = 3 ⋅23359125187.

It is not a de Polignac number, because 16557377007 - 2²³ = 16548988399 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 (16557377107) 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, 2759562832 + ... + 2759562837.

It is an arithmetic number, because the mean of its divisors is an integer number (5519125670).

Almost surely, 2^16557377007 is an apocalyptic number.

16557377007 is a deficient number, since it is larger than the sum of its proper divisors (5519125673).

16557377007 is an equidigital number, since it uses as much as digits as its factorization.

16557377007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5519125672.

The product of its (nonzero) digits is 1080450, while the sum is 48.

The spelling of 16557377007 in words is "sixteen billion, five hundred fifty-seven million, three hundred seventy-seven thousand, seven".