15901711649 has 4 divisors (see below), whose sum is σ = 15916129536. Its totient is φ = 15887293764.

The previous prime is 15901711633. The next prime is 15901711703. The reversal of 15901711649 is 94611710951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15901711649 - 2⁴ = 15901711633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15901711349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7207289 + ... + 7209494.

It is an arithmetic number, because the mean of its divisors is an integer number (3979032384).

Almost surely, 2^15901711649 is an apocalyptic number.

It is an amenable number.

15901711649 is a deficient number, since it is larger than the sum of its proper divisors (14417887).

15901711649 is a wasteful number, since it uses less digits than its factorization.

15901711649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14417886.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 15901711649 in words is "fifteen billion, nine hundred one million, seven hundred eleven thousand, six hundred forty-nine".