13991990649 has 16 divisors (see below), whose sum is σ = 22961215872. Its totient is φ = 7380390528.

The previous prime is 13991990611. The next prime is 13991990651. The reversal of 13991990649 is 94609919931.

It is not a de Polignac number, because 13991990649 - 2⁷ = 13991990521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13991990592 and 13991990601.

It is not an unprimeable number, because it can be changed into a prime (13991990609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25626084 + ... + 25626629.

It is an arithmetic number, because the mean of its divisors is an integer number (1435075992).

Almost surely, 2^13991990649 is an apocalyptic number.

It is an amenable number.

13991990649 is a deficient number, since it is larger than the sum of its proper divisors (8969225223).

13991990649 is a wasteful number, since it uses less digits than its factorization.

13991990649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51252736.

The product of its (nonzero) digits is 4251528, while the sum is 60.

The spelling of 13991990649 in words is "thirteen billion, nine hundred ninety-one million, nine hundred ninety thousand, six hundred forty-nine".