16929749557 has 24 divisors (see below), whose sum is σ = 20871117720. Its totient is φ = 13645255680.

The previous prime is 16929749549. The next prime is 16929749651. The reversal of 16929749557 is 75594792961.

It can be written as a sum of positive squares in 4 ways, for example, as 8101080036 + 8828669521 = 90006^2 + 93961^2 .

It is not a de Polignac number, because 16929749557 - 2³ = 16929749549 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 (16929749857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 975169 + ... + 992377.

It is an arithmetic number, because the mean of its divisors is an integer number (869629905).

Almost surely, 2^16929749557 is an apocalyptic number.

16929749557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16929749557 is a deficient number, since it is larger than the sum of its proper divisors (3941368163).

16929749557 is a wasteful number, since it uses less digits than its factorization.

16929749557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18421 (or 18414 counting only the distinct ones).

The product of its digits is 42865200, while the sum is 64.

The spelling of 16929749557 in words is "sixteen billion, nine hundred twenty-nine million, seven hundred forty-nine thousand, five hundred fifty-seven".