15800421970 has 16 divisors (see below), whose sum is σ = 28455977880. Its totient is φ = 6316786944.

The previous prime is 15800421929. The next prime is 15800421991. The reversal of 15800421970 is 7912400851.

It can be written as a sum of positive squares in 4 ways, for example, as 6526539369 + 9273882601 = 80787^2 + 96301^2 .

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 7 ways as a sum of consecutive naturals, for example, 403065 + ... + 440524.

Almost surely, 2^15800421970 is an apocalyptic number.

15800421970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15800421970 is a deficient number, since it is larger than the sum of its proper divisors (12655555910).

15800421970 is a wasteful number, since it uses less digits than its factorization.

15800421970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845469.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 15800421970 in words is "fifteen billion, eight hundred million, four hundred twenty-one thousand, nine hundred seventy".