16978785514 has 8 divisors (see below), whose sum is σ = 25475838660. Its totient is φ = 8486839296.

The previous prime is 16978785497. The next prime is 16978785557. The reversal of 16978785514 is 41558787961.

It can be written as a sum of positive squares in 2 ways, for example, as 16357131025 + 621654489 = 127895^2 + 24933^2 .

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

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, 1268409 + ... + 1281724.

Almost surely, 2^16978785514 is an apocalyptic number.

16978785514 is a deficient number, since it is larger than the sum of its proper divisors (8497053146).

16978785514 is a wasteful number, since it uses less digits than its factorization.

16978785514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553464.

The product of its digits is 16934400, while the sum is 61.

The spelling of 16978785514 in words is "sixteen billion, nine hundred seventy-eight million, seven hundred eighty-five thousand, five hundred fourteen".