16079781557 has 4 divisors (see below), whose sum is σ = 18376893216. Its totient is φ = 13782669900.

The previous prime is 16079781527. The next prime is 16079781563. The reversal of 16079781557 is 75518797061.

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 a cyclic number.

It is not a de Polignac number, because 16079781557 - 2¹⁶ = 16079716021 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 (16079781527) 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, 1148555819 + ... + 1148555832.

It is an arithmetic number, because the mean of its divisors is an integer number (4594223304).

Almost surely, 2^16079781557 is an apocalyptic number.

It is an amenable number.

16079781557 is a deficient number, since it is larger than the sum of its proper divisors (2297111659).

16079781557 is an equidigital number, since it uses as much as digits as its factorization.

16079781557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297111658.

The product of its (nonzero) digits is 3704400, while the sum is 56.

The spelling of 16079781557 in words is "sixteen billion, seventy-nine million, seven hundred eighty-one thousand, five hundred fifty-seven".