664737010181 has 2 divisors, whose sum is σ = 664737010182. Its totient is φ = 664737010180.

The previous prime is 664737010141. The next prime is 664737010279. The reversal of 664737010181 is 181010737466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651596056225 + 13140953956 = 807215^2 + 114634^2 .

It is a cyclic number.

It is not a de Polignac number, because 664737010181 - 2²⁶ = 664669901317 is a prime.

It is a super-2 number, since 2×664737010181² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664737010141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332368505090 + 332368505091.

It is an arithmetic number, because the mean of its divisors is an integer number (332368505091).

Almost surely, 2^664737010181 is an apocalyptic number.

It is an amenable number.

664737010181 is a deficient number, since it is larger than the sum of its proper divisors (1).

664737010181 is an equidigital number, since it uses as much as digits as its factorization.

664737010181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 664737010181 in words is "six hundred sixty-four billion, seven hundred thirty-seven million, ten thousand, one hundred eighty-one".