15995290649 has 8 divisors (see below), whose sum is σ = 17228606472. Its totient is φ = 14762390400.

The previous prime is 15995290631. The next prime is 15995290697. The reversal of 15995290649 is 94609259951.

It can be written as a sum of positive squares in 4 ways, for example, as 196560400 + 15798730249 = 14020^2 + 125693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15995290649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15995290609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21524 + ... + 180149.

It is an arithmetic number, because the mean of its divisors is an integer number (2153575809).

Almost surely, 2^15995290649 is an apocalyptic number.

It is an amenable number.

15995290649 is a deficient number, since it is larger than the sum of its proper divisors (1233315823).

15995290649 is a wasteful number, since it uses less digits than its factorization.

15995290649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207787.

The product of its (nonzero) digits is 7873200, while the sum is 59.

The spelling of 15995290649 in words is "fifteen billion, nine hundred ninety-five million, two hundred ninety thousand, six hundred forty-nine".