16616179978 has 8 divisors (see below), whose sum is σ = 24924978468. Its totient is φ = 8307853824.

The previous prime is 16616179949. The next prime is 16616179997. The reversal of 16616179978 is 87997161661.

It can be written as a sum of positive squares in 2 ways, for example, as 15952447809 + 663732169 = 126303^2 + 25763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16616179978² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10551 + ... + 182602.

Almost surely, 2^16616179978 is an apocalyptic number.

16616179978 is a deficient number, since it is larger than the sum of its proper divisors (8308798490).

16616179978 is a wasteful number, since it uses less digits than its factorization.

16616179978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236168.

The product of its digits is 6858432, while the sum is 61.

The spelling of 16616179978 in words is "sixteen billion, six hundred sixteen million, one hundred seventy-nine thousand, nine hundred seventy-eight".