15697919944 has 48 divisors (see below), whose sum is σ = 34129356480. Its totient is φ = 6629585760.

The previous prime is 15697919933. The next prime is 15697919953. The reversal of 15697919944 is 44991979651.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7899319 + ... + 7901305.

It is an arithmetic number, because the mean of its divisors is an integer number (711028260).

Almost surely, 2^15697919944 is an apocalyptic number.

15697919944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15697919944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17064678240).

15697919944 is an abundant number, since it is smaller than the sum of its proper divisors (18431436536).

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

15697919944 is an frugal number, since it uses more digits than its factorization.

15697919944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058 (or 2067 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 64.

The spelling of 15697919944 in words is "fifteen billion, six hundred ninety-seven million, nine hundred nineteen thousand, nine hundred forty-four".