61605870399397 has 2 divisors, whose sum is σ = 61605870399398. Its totient is φ = 61605870399396.

The previous prime is 61605870399349. The next prime is 61605870399407. The reversal of 61605870399397 is 79399307850616.

61605870399397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45531536262436 + 16074334136961 = 6747706^2 + 4009281^2 .

It is a cyclic number.

It is not a de Polignac number, because 61605870399397 - 2²⁷ = 61605736181669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61605870399497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30802935199698 + 30802935199699.

It is an arithmetic number, because the mean of its divisors is an integer number (30802935199699).

Almost surely, 2^{61605870399397} is an apocalyptic number.

It is an amenable number.

61605870399397 is a deficient number, since it is larger than the sum of its proper divisors (1).

61605870399397 is an equidigital number, since it uses as much as digits as its factorization.

61605870399397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 462944160, while the sum is 73.

The spelling of 61605870399397 in words is "sixty-one trillion, six hundred five billion, eight hundred seventy million, three hundred ninety-nine thousand, three hundred ninety-seven".