61078579213 has 2 divisors, whose sum is σ = 61078579214. Its totient is φ = 61078579212.

The previous prime is 61078579193. The next prime is 61078579229. The reversal of 61078579213 is 31297587016.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58024137924 + 3054441289 = 240882^2 + 55267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61078579213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61078579253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30539289606 + 30539289607.

It is an arithmetic number, because the mean of its divisors is an integer number (30539289607).

Almost surely, 2^61078579213 is an apocalyptic number.

It is an amenable number.

61078579213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61078579213 is an equidigital number, since it uses as much as digits as its factorization.

61078579213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 61078579213 in words is "sixty-one billion, seventy-eight million, five hundred seventy-nine thousand, two hundred thirteen".