13220309957 has 2 divisors, whose sum is σ = 13220309958. Its totient is φ = 13220309956.

The previous prime is 13220309939. The next prime is 13220309987. The reversal of 13220309957 is 75990302231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10042845796 + 3177464161 = 100214^2 + 56369^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220309957 - 2⁸ = 13220309701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13220309987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610154978 + 6610154979.

It is an arithmetic number, because the mean of its divisors is an integer number (6610154979).

Almost surely, 2^13220309957 is an apocalyptic number.

It is an amenable number.

13220309957 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220309957 is an equidigital number, since it uses as much as digits as its factorization.

13220309957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 41.

The spelling of 13220309957 in words is "thirteen billion, two hundred twenty million, three hundred nine thousand, nine hundred fifty-seven".