45591613681 has 2 divisors, whose sum is σ = 45591613682. Its totient is φ = 45591613680.

The previous prime is 45591613649. The next prime is 45591613703. The reversal of 45591613681 is 18631619554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44529440400 + 1062173281 = 211020^2 + 32591^2 .

It is a cyclic number.

It is not a de Polignac number, because 45591613681 - 2⁵ = 45591613649 is a prime.

It is a super-2 number, since 2×45591613681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (45591613621) 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, 22795806840 + 22795806841.

It is an arithmetic number, because the mean of its divisors is an integer number (22795806841).

Almost surely, 2^45591613681 is an apocalyptic number.

It is an amenable number.

45591613681 is a deficient number, since it is larger than the sum of its proper divisors (1).

45591613681 is an equidigital number, since it uses as much as digits as its factorization.

45591613681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 49.

The spelling of 45591613681 in words is "forty-five billion, five hundred ninety-one million, six hundred thirteen thousand, six hundred eighty-one".