15999233530 has 48 divisors (see below), whose sum is σ = 33580442376. Its totient is φ = 5472351360.

The previous prime is 15999233513. The next prime is 15999233567. The reversal of 15999233530 is 3533299951.

It can be written as a sum of positive squares in 4 ways, for example, as 4638018609 + 11361214921 = 68103^2 + 106589^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167512 + ... + 245068.

Almost surely, 2^15999233530 is an apocalyptic number.

15999233530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15999233530 is an abundant number, since it is smaller than the sum of its proper divisors (17581208846).

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

15999233530 is a wasteful number, since it uses less digits than its factorization.

15999233530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77999 (or 77992 counting only the distinct ones).

The product of its (nonzero) digits is 984150, while the sum is 49.

The spelling of 15999233530 in words is "fifteen billion, nine hundred ninety-nine million, two hundred thirty-three thousand, five hundred thirty".