15995999745 has 96 divisors (see below), whose sum is σ = 31321180800. Its totient is φ = 7739867520.

The previous prime is 15995999743. The next prime is 15995999753. The reversal of 15995999745 is 54799959951.

It is not a de Polignac number, because 15995999745 - 2¹ = 15995999743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15995999743) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14423251 + ... + 14424359.

It is an arithmetic number, because the mean of its divisors is an integer number (326262300).

Almost surely, 2^15995999745 is an apocalyptic number.

15995999745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15995999745 is a deficient number, since it is larger than the sum of its proper divisors (15325181055).

15995999745 is a wasteful number, since it uses less digits than its factorization.

15995999745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 2011 counting only the distinct ones).

The product of its digits is 206671500, while the sum is 72.

The spelling of 15995999745 in words is "fifteen billion, nine hundred ninety-five million, nine hundred ninety-nine thousand, seven hundred forty-five".