61618271399 has 2 divisors, whose sum is σ = 61618271400. Its totient is φ = 61618271398.

The previous prime is 61618271369. The next prime is 61618271413. The reversal of 61618271399 is 99317281616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61618271399 is a prime.

It is a super-2 number, since 2×61618271399² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61618271399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61618271339) 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, 30809135699 + 30809135700.

It is an arithmetic number, because the mean of its divisors is an integer number (30809135700).

Almost surely, 2^61618271399 is an apocalyptic number.

61618271399 is a deficient number, since it is larger than the sum of its proper divisors (1).

61618271399 is an equidigital number, since it uses as much as digits as its factorization.

61618271399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The spelling of 61618271399 in words is "sixty-one billion, six hundred eighteen million, two hundred seventy-one thousand, three hundred ninety-nine".