61685760001 has 2 divisors, whose sum is σ = 61685760002. Its totient is φ = 61685760000.

The previous prime is 61685759981. The next prime is 61685760047. The reversal of 61685760001 is 10006758616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46894335601 + 14791424400 = 216551^2 + 121620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61685760001 is a prime.

It is not a weakly prime, because it can be changed into another prime (61685760061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30842880000 + 30842880001.

It is an arithmetic number, because the mean of its divisors is an integer number (30842880001).

Almost surely, 2^61685760001 is an apocalyptic number.

It is an amenable number.

61685760001 is a deficient number, since it is larger than the sum of its proper divisors (1).

61685760001 is an equidigital number, since it uses as much as digits as its factorization.

61685760001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 61685760001 in words is "sixty-one billion, six hundred eighty-five million, seven hundred sixty thousand, one".