15991142625445 has 32 divisors (see below), whose sum is σ = 20714419645920. Its totient is φ = 11780904038400.

The previous prime is 15991142625421. The next prime is 15991142625461. The reversal of 15991142625445 is 54452624119951.

It can be written as a sum of positive squares in 16 ways, for example, as 4303728658849 + 11687413966596 = 2074543^2 + 3418686^2 .

It is not a de Polignac number, because 15991142625445 - 2⁵ = 15991142625413 is a prime.

It is a super-2 number, since 2×15991142625445² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15991142625445.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 55680657 + ... + 55967113.

It is an arithmetic number, because the mean of its divisors is an integer number (647325613935).

Almost surely, 2^{15991142625445} is an apocalyptic number.

It is an amenable number.

15991142625445 is a deficient number, since it is larger than the sum of its proper divisors (4723277020475).

15991142625445 is a wasteful number, since it uses less digits than its factorization.

15991142625445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288505.

The product of its digits is 15552000, while the sum is 58.

The spelling of 15991142625445 in words is "fifteen trillion, nine hundred ninety-one billion, one hundred forty-two million, six hundred twenty-five thousand, four hundred forty-five".