15972022909780 has 120 divisors (see below), whose sum is σ = 39144523301352. Its totient is φ = 5473967579136.

The previous prime is 15972022909751. The next prime is 15972022909837. The reversal of 15972022909780 is 8790922027951.

It can be written as a sum of positive squares in 4 ways, for example, as 54492366096 + 15917530543684 = 233436^2 + 3989678^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 124451724 + ... + 124579996.

Almost surely, 2^{15972022909780} is an apocalyptic number.

15972022909780 is a gapful number since it is divisible by the number (10) 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 15972022909780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19572261650676).

15972022909780 is an abundant number, since it is smaller than the sum of its proper divisors (23172500391572).

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

15972022909780 is a wasteful number, since it uses less digits than its factorization.

15972022909780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130903 (or 130880 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 15972022909780 in words is "fifteen trillion, nine hundred seventy-two billion, twenty-two million, nine hundred nine thousand, seven hundred eighty".