15977218212672 has 224 divisors, whose sum is σ = 43382764339200. Its totient is φ = 5187965583360.

The previous prime is 15977218212647. The next prime is 15977218212763. The reversal of 15977218212672 is 27621281277951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 630426433 + ... + 630451775.

Almost surely, 2^{15977218212672} is an apocalyptic number.

15977218212672 is a gapful number since it is divisible by the number (12) 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 15977218212672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21691382169600).

15977218212672 is an abundant number, since it is smaller than the sum of its proper divisors (27405546126528).

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

15977218212672 is a wasteful number, since it uses less digits than its factorization.

15977218212672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25981 (or 25971 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 60.

The spelling of 15977218212672 in words is "fifteen trillion, nine hundred seventy-seven billion, two hundred eighteen million, two hundred twelve thousand, six hundred seventy-two".