15993953440 has 48 divisors (see below), whose sum is σ = 39428581248. Its totient is φ = 6119424256.

The previous prime is 15993953419. The next prime is 15993953467. The reversal of 15993953440 is 4435939951.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2169412 + ... + 2176771.

It is an arithmetic number, because the mean of its divisors is an integer number (821428776).

Almost surely, 2^15993953440 is an apocalyptic number.

15993953440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15993953440 is an abundant number, since it is smaller than the sum of its proper divisors (23434627808).

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

15993953440 is a wasteful number, since it uses less digits than its factorization.

15993953440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346221 (or 4346213 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 52.

The spelling of 15993953440 in words is "fifteen billion, nine hundred ninety-three million, nine hundred fifty-three thousand, four hundred forty".