13621607977 has 2 divisors, whose sum is σ = 13621607978. Its totient is φ = 13621607976.

The previous prime is 13621607971. The next prime is 13621608017. The reversal of 13621607977 is 77970612631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12387912601 + 1233695376 = 111301^2 + 35124^2 .

It is an emirp because it is prime and its reverse (77970612631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13621607977 - 2⁷ = 13621607849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13621607977.

It is not a weakly prime, because it can be changed into another prime (13621607971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810803988 + 6810803989.

It is an arithmetic number, because the mean of its divisors is an integer number (6810803989).

Almost surely, 2^13621607977 is an apocalyptic number.

It is an amenable number.

13621607977 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621607977 is an equidigital number, since it uses as much as digits as its factorization.

13621607977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 49.

The spelling of 13621607977 in words is "thirteen billion, six hundred twenty-one million, six hundred seven thousand, nine hundred seventy-seven".