16121294564 has 12 divisors (see below), whose sum is σ = 28215245100. Its totient is φ = 8059795968.

The previous prime is 16121294551. The next prime is 16121294593. The reversal of 16121294564 is 46549212161.

It can be written as a sum of positive squares in 2 ways, for example, as 8035688164 + 8085606400 = 89642^2 + 89920^2 .

It is a super-2 number, since 2×16121294564² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169229 + ... + 246740.

It is an arithmetic number, because the mean of its divisors is an integer number (2351270425).

Almost surely, 2^16121294564 is an apocalyptic number.

It is an amenable number.

16121294564 is a deficient number, since it is larger than the sum of its proper divisors (12093950536).

16121294564 is a wasteful number, since it uses less digits than its factorization.

16121294564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425662 (or 425660 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The spelling of 16121294564 in words is "sixteen billion, one hundred twenty-one million, two hundred ninety-four thousand, five hundred sixty-four".