1641677256013 has 2 divisors, whose sum is σ = 1641677256014. Its totient is φ = 1641677256012.

The previous prime is 1641677255987. The next prime is 1641677256029. The reversal of 1641677256013 is 3106527761461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978955894084 + 662721361929 = 989422^2 + 814077^2 .

It is an emirp because it is prime and its reverse (3106527761461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641677256013 - 2²¹ = 1641675158861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641677256073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820838628006 + 820838628007.

It is an arithmetic number, because the mean of its divisors is an integer number (820838628007).

Almost surely, 2^{1641677256013} is an apocalyptic number.

It is an amenable number.

1641677256013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641677256013 is an equidigital number, since it uses as much as digits as its factorization.

1641677256013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 1641677256013 in words is "one trillion, six hundred forty-one billion, six hundred seventy-seven million, two hundred fifty-six thousand, thirteen".