36660681961 has 2 divisors, whose sum is σ = 36660681962. Its totient is φ = 36660681960.

The previous prime is 36660681817. The next prime is 36660681989. The reversal of 36660681961 is 16918606663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36427539600 + 233142361 = 190860^2 + 15269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36660681961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 36660681899 and 36660681908.

It is not a weakly prime, because it can be changed into another prime (36660681061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18330340980 + 18330340981.

It is an arithmetic number, because the mean of its divisors is an integer number (18330340981).

Almost surely, 2^36660681961 is an apocalyptic number.

It is an amenable number.

36660681961 is a deficient number, since it is larger than the sum of its proper divisors (1).

36660681961 is an equidigital number, since it uses as much as digits as its factorization.

36660681961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 36660681961 in words is "thirty-six billion, six hundred sixty million, six hundred eighty-one thousand, nine hundred sixty-one".