16451642320 has 40 divisors (see below), whose sum is σ = 38644417224. Its totient is φ = 6512812032.

The previous prime is 16451642303. The next prime is 16451642327. The reversal of 16451642320 is 2324615461.

It can be written as a sum of positive squares in 4 ways, for example, as 6526700944 + 9924941376 = 80788^2 + 99624^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16451642327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1052269 + ... + 1067788.

Almost surely, 2^16451642320 is an apocalyptic number.

16451642320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16451642320 is an abundant number, since it is smaller than the sum of its proper divisors (22192774904).

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

16451642320 is a wasteful number, since it uses less digits than its factorization.

16451642320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120167 (or 2120161 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 16451642320 in words is "sixteen billion, four hundred fifty-one million, six hundred forty-two thousand, three hundred twenty".