13651157621 has 2 divisors, whose sum is σ = 13651157622. Its totient is φ = 13651157620.

The previous prime is 13651157591. The next prime is 13651157623. The reversal of 13651157621 is 12675115631.

It is a happy number.

13651157621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13446953521 + 204204100 = 115961^2 + 14290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13651157621 is a prime.

Together with 13651157623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13651157623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6825578810 + 6825578811.

It is an arithmetic number, because the mean of its divisors is an integer number (6825578811).

Almost surely, 2^13651157621 is an apocalyptic number.

It is an amenable number.

13651157621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13651157621 is an equidigital number, since it uses as much as digits as its factorization.

13651157621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The spelling of 13651157621 in words is "thirteen billion, six hundred fifty-one million, one hundred fifty-seven thousand, six hundred twenty-one".