664462402641 has 12 divisors (see below), whose sum is σ = 960798994740. Its totient is φ = 442504180320.

The previous prime is 664462402613. The next prime is 664462402651. The reversal of 664462402641 is 146204264466.

It can be written as a sum of positive squares in 2 ways, for example, as 521567062416 + 142895340225 = 722196^2 + 378015^2 .

It is not a de Polignac number, because 664462402641 - 2²¹ = 664460305489 is a prime.

It is a super-3 number, since 3×664462402641³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664462402651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39220626 + ... + 39237563.

It is an arithmetic number, because the mean of its divisors is an integer number (80066582895).

Almost surely, 2^664462402641 is an apocalyptic number.

It is an amenable number.

664462402641 is a deficient number, since it is larger than the sum of its proper divisors (296336592099).

664462402641 is a wasteful number, since it uses less digits than its factorization.

664462402641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78459136 (or 78459133 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 45.

The spelling of 664462402641 in words is "six hundred sixty-four billion, four hundred sixty-two million, four hundred two thousand, six hundred forty-one".