15972265745281 has 4 divisors (see below), whose sum is σ = 15972329090772. Its totient is φ = 15972202399792.

The previous prime is 15972265745257. The next prime is 15972265745299. The reversal of 15972265745281 is 18254756227951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3840976745281 + 12131289000000 = 1959841^2 + 3483000^2 .

It is a cyclic number.

It is not a de Polignac number, because 15972265745281 - 2¹³ = 15972265737089 is a prime.

It is a super-2 number, since 2×15972265745281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15972265745221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31293010 + ... + 31799323.

It is an arithmetic number, because the mean of its divisors is an integer number (3993082272693).

Almost surely, 2^{15972265745281} is an apocalyptic number.

It is an amenable number.

15972265745281 is a deficient number, since it is larger than the sum of its proper divisors (63345491).

15972265745281 is an equidigital number, since it uses as much as digits as its factorization.

15972265745281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63345490.

The product of its digits is 84672000, while the sum is 64.

The spelling of 15972265745281 in words is "fifteen trillion, nine hundred seventy-two billion, two hundred sixty-five million, seven hundred forty-five thousand, two hundred eighty-one".