664801787057 has 2 divisors, whose sum is σ = 664801787058. Its totient is φ = 664801787056.

The previous prime is 664801786981. The next prime is 664801787063. The reversal of 664801787057 is 750787108466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390313812001 + 274487975056 = 624751^2 + 523916^2 .

It is a cyclic number.

It is not a de Polignac number, because 664801787057 - 2⁸ = 664801786801 is a prime.

It is a super-2 number, since 2×664801787057² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664801786987 and 664801787005.

It is not a weakly prime, because it can be changed into another prime (664801784057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332400893528 + 332400893529.

It is an arithmetic number, because the mean of its divisors is an integer number (332400893529).

Almost surely, 2^664801787057 is an apocalyptic number.

It is an amenable number.

664801787057 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801787057 is an equidigital number, since it uses as much as digits as its factorization.

664801787057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 664801787057 in words is "six hundred sixty-four billion, eight hundred one million, seven hundred eighty-seven thousand, fifty-seven".