861646030057 has 2 divisors, whose sum is σ = 861646030058. Its totient is φ = 861646030056.

The previous prime is 861646030009. The next prime is 861646030127. The reversal of 861646030057 is 750030646168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547512683481 + 314133346576 = 739941^2 + 560476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861646030057 is a prime.

It is a super-2 number, since 2×861646030057² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861646029989 and 861646030016.

It is not a weakly prime, because it can be changed into another prime (861646000057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430823015028 + 430823015029.

It is an arithmetic number, because the mean of its divisors is an integer number (430823015029).

Almost surely, 2^861646030057 is an apocalyptic number.

It is an amenable number.

861646030057 is a deficient number, since it is larger than the sum of its proper divisors (1).

861646030057 is an equidigital number, since it uses as much as digits as its factorization.

861646030057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 861646030057 in words is "eight hundred sixty-one billion, six hundred forty-six million, thirty thousand, fifty-seven".