61561366747 has 2 divisors, whose sum is σ = 61561366748. Its totient is φ = 61561366746.

The previous prime is 61561366639. The next prime is 61561366793. The reversal of 61561366747 is 74766316516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61561366747 - 2²³ = 61552978139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61561366694 and 61561366703.

It is not a weakly prime, because it can be changed into another prime (61561306747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780683373 + 30780683374.

It is an arithmetic number, because the mean of its divisors is an integer number (30780683374).

Almost surely, 2^61561366747 is an apocalyptic number.

61561366747 is a deficient number, since it is larger than the sum of its proper divisors (1).

61561366747 is an equidigital number, since it uses as much as digits as its factorization.

61561366747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The spelling of 61561366747 in words is "sixty-one billion, five hundred sixty-one million, three hundred sixty-six thousand, seven hundred forty-seven".