641152633657 has 2 divisors, whose sum is σ = 641152633658. Its totient is φ = 641152633656.

The previous prime is 641152633423. The next prime is 641152633663. The reversal of 641152633657 is 756336251146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639033964816 + 2118668841 = 799396^2 + 46029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641152633657 is a prime.

It is a super-2 number, since 2×641152633657² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641152633657.

It is not a weakly prime, because it can be changed into another prime (641152633157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320576316828 + 320576316829.

It is an arithmetic number, because the mean of its divisors is an integer number (320576316829).

Almost surely, 2^641152633657 is an apocalyptic number.

It is an amenable number.

641152633657 is a deficient number, since it is larger than the sum of its proper divisors (1).

641152633657 is an equidigital number, since it uses as much as digits as its factorization.

641152633657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 49.

The spelling of 641152633657 in words is "six hundred forty-one billion, one hundred fifty-two million, six hundred thirty-three thousand, six hundred fifty-seven".