615811198213 has 2 divisors, whose sum is σ = 615811198214. Its totient is φ = 615811198212.

The previous prime is 615811198207. The next prime is 615811198237. The reversal of 615811198213 is 312891118516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354355897284 + 261455300929 = 595278^2 + 511327^2 .

It is a cyclic number.

It is not a de Polignac number, because 615811198213 - 2³⁷ = 478372244741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615811198313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307905599106 + 307905599107.

It is an arithmetic number, because the mean of its divisors is an integer number (307905599107).

Almost surely, 2^615811198213 is an apocalyptic number.

It is an amenable number.

615811198213 is a deficient number, since it is larger than the sum of its proper divisors (1).

615811198213 is an equidigital number, since it uses as much as digits as its factorization.

615811198213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 46.

The spelling of 615811198213 in words is "six hundred fifteen billion, eight hundred eleven million, one hundred ninety-eight thousand, two hundred thirteen".