61554397313 has 2 divisors, whose sum is σ = 61554397314. Its totient is φ = 61554397312.

The previous prime is 61554397309. The next prime is 61554397321. The reversal of 61554397313 is 31379345516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50844838144 + 10709559169 = 225488^2 + 103487^2 .

It is a cyclic number.

It is not a de Polignac number, because 61554397313 - 2² = 61554397309 is a prime.

It is not a weakly prime, because it can be changed into another prime (61554396313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777198656 + 30777198657.

It is an arithmetic number, because the mean of its divisors is an integer number (30777198657).

Almost surely, 2^61554397313 is an apocalyptic number.

It is an amenable number.

61554397313 is a deficient number, since it is larger than the sum of its proper divisors (1).

61554397313 is an equidigital number, since it uses as much as digits as its factorization.

61554397313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 47.

The spelling of 61554397313 in words is "sixty-one billion, five hundred fifty-four million, three hundred ninety-seven thousand, three hundred thirteen".