615441121613 has 2 divisors, whose sum is σ = 615441121614. Its totient is φ = 615441121612.

The previous prime is 615441121597. The next prime is 615441121621. The reversal of 615441121613 is 316121144516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341287303204 + 274153818409 = 584198^2 + 523597^2 .

It is a cyclic number.

It is not a de Polignac number, because 615441121613 - 2⁴ = 615441121597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615441121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307720560806 + 307720560807.

It is an arithmetic number, because the mean of its divisors is an integer number (307720560807).

Almost surely, 2^615441121613 is an apocalyptic number.

It is an amenable number.

615441121613 is a deficient number, since it is larger than the sum of its proper divisors (1).

615441121613 is an equidigital number, since it uses as much as digits as its factorization.

615441121613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The spelling of 615441121613 in words is "six hundred fifteen billion, four hundred forty-one million, one hundred twenty-one thousand, six hundred thirteen".