13990669521 has 16 divisors (see below), whose sum is σ = 18937192704. Its totient is φ = 9185696784.

The previous prime is 13990669487. The next prime is 13990669523. The reversal of 13990669521 is 12596609931.

It is not a de Polignac number, because 13990669521 - 2¹¹ = 13990667473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13990669523) 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, 1584906 + ... + 1593708.

It is an arithmetic number, because the mean of its divisors is an integer number (1183574544).

Almost surely, 2^13990669521 is an apocalyptic number.

It is an amenable number.

13990669521 is a deficient number, since it is larger than the sum of its proper divisors (4946523183).

13990669521 is an equidigital number, since it uses as much as digits as its factorization.

13990669521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16780.

The product of its (nonzero) digits is 787320, while the sum is 51.

The spelling of 13990669521 in words is "thirteen billion, nine hundred ninety million, six hundred sixty-nine thousand, five hundred twenty-one".