15917801216 has 72 divisors (see below), whose sum is σ = 34277708304. Its totient is φ = 7349288960.

The previous prime is 15917801203. The next prime is 15917801231. The reversal of 15917801216 is 61210871951.

It is a happy number.

It is a congruent number.

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, 196151 + ... + 265161.

It is an arithmetic number, because the mean of its divisors is an integer number (476079282).

Almost surely, 2^15917801216 is an apocalyptic number.

15917801216 is a gapful number since it is divisible by the number (16) 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 15917801216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17138854152).

15917801216 is an abundant number, since it is smaller than the sum of its proper divisors (18359907088).

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

15917801216 is an equidigital number, since it uses as much as digits as its factorization.

15917801216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69097 (or 69083 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 41.

The spelling of 15917801216 in words is "fifteen billion, nine hundred seventeen million, eight hundred one thousand, two hundred sixteen".