15720163381 has 12 divisors (see below), whose sum is σ = 17983837732. Its totient is φ = 13657333248.

The previous prime is 15720163369. The next prime is 15720163391. The reversal of 15720163381 is 18336102751.

It can be written as a sum of positive squares in 6 ways, for example, as 38862756 + 15681300625 = 6234^2 + 125225^2 .

It is not a de Polignac number, because 15720163381 - 2³¹ = 13572679733 is a prime.

It is a super-2 number, since 2×15720163381² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15720163381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15720163391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2088360 + ... + 2095873.

Almost surely, 2^15720163381 is an apocalyptic number.

It is an amenable number.

15720163381 is a deficient number, since it is larger than the sum of its proper divisors (2263674351).

15720163381 is a wasteful number, since it uses less digits than its factorization.

15720163381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184280 (or 4184263 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

It can be divided in two parts, 15720 and 163381, that added together give a triangular number (179101 = T₅₉₈).

The spelling of 15720163381 in words is "fifteen billion, seven hundred twenty million, one hundred sixty-three thousand, three hundred eighty-one".