16451993994 has 8 divisors (see below), whose sum is σ = 32903988000. Its totient is φ = 5483997996.

The previous prime is 16451993977. The next prime is 16451994007. The reversal of 16451993994 is 49939915461.

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

16451993994 is an admirable number.

It is a super-2 number, since 2×16451993994² (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, 1370999494 + ... + 1370999505.

It is an arithmetic number, because the mean of its divisors is an integer number (4112998500).

Almost surely, 2^16451993994 is an apocalyptic number.

16451993994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16451993994 is a wasteful number, since it uses less digits than its factorization.

16451993994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741999004.

The product of its digits is 9447840, while the sum is 60.

The spelling of 16451993994 in words is "sixteen billion, four hundred fifty-one million, nine hundred ninety-three thousand, nine hundred ninety-four".