61366581137 has 2 divisors, whose sum is σ = 61366581138. Its totient is φ = 61366581136.

The previous prime is 61366581127. The next prime is 61366581161. The reversal of 61366581137 is 73118566316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35043465601 + 26323115536 = 187199^2 + 162244^2 .

It is a cyclic number.

It is not a de Polignac number, because 61366581137 - 2⁸ = 61366580881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61366581091 and 61366581100.

It is not a weakly prime, because it can be changed into another prime (61366581127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30683290568 + 30683290569.

It is an arithmetic number, because the mean of its divisors is an integer number (30683290569).

Almost surely, 2^61366581137 is an apocalyptic number.

It is an amenable number.

61366581137 is a deficient number, since it is larger than the sum of its proper divisors (1).

61366581137 is an equidigital number, since it uses as much as digits as its factorization.

61366581137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The spelling of 61366581137 in words is "sixty-one billion, three hundred sixty-six million, five hundred eighty-one thousand, one hundred thirty-seven".