185038717681 has 2 divisors, whose sum is σ = 185038717682. Its totient is φ = 185038717680.

The previous prime is 185038717657. The next prime is 185038717729. The reversal of 185038717681 is 186717830581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99298093456 + 85740624225 = 315116^2 + 292815^2 .

It is a cyclic number.

It is not a de Polignac number, because 185038717681 - 2⁵ = 185038717649 is a prime.

It is a super-2 number, since 2×185038717681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (185038717601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92519358840 + 92519358841.

It is an arithmetic number, because the mean of its divisors is an integer number (92519358841).

Almost surely, 2^185038717681 is an apocalyptic number.

It is an amenable number.

185038717681 is a deficient number, since it is larger than the sum of its proper divisors (1).

185038717681 is an equidigital number, since it uses as much as digits as its factorization.

185038717681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 55.

The spelling of 185038717681 in words is "one hundred eighty-five billion, thirty-eight million, seven hundred seventeen thousand, six hundred eighty-one".