61817333761 has 2 divisors, whose sum is σ = 61817333762. Its totient is φ = 61817333760.

The previous prime is 61817333741. The next prime is 61817333789. The reversal of 61817333761 is 16733371816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56059559361 + 5757774400 = 236769^2 + 75880^2 .

It is a cyclic number.

It is not a de Polignac number, because 61817333761 - 2⁵ = 61817333729 is a prime.

It is not a weakly prime, because it can be changed into another prime (61817333731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30908666880 + 30908666881.

It is an arithmetic number, because the mean of its divisors is an integer number (30908666881).

Almost surely, 2^61817333761 is an apocalyptic number.

It is an amenable number.

61817333761 is a deficient number, since it is larger than the sum of its proper divisors (1).

61817333761 is an equidigital number, since it uses as much as digits as its factorization.

61817333761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 46.

The spelling of 61817333761 in words is "sixty-one billion, eight hundred seventeen million, three hundred thirty-three thousand, seven hundred sixty-one".