1640464601 has 2 divisors, whose sum is σ = 1640464602. Its totient is φ = 1640464600.

The previous prime is 1640464559. The next prime is 1640464619. The reversal of 1640464601 is 1064640461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052353600 + 588111001 = 32440^2 + 24251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640464601 - 2⁶ = 1640464537 is a prime.

It is a super-2 number, since 2×1640464601² = 5382248214268178402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1640464621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820232300 + 820232301.

It is an arithmetic number, because the mean of its divisors is an integer number (820232301).

Almost surely, 2^1640464601 is an apocalyptic number.

It is an amenable number.

1640464601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640464601 is an equidigital number, since it uses as much as digits as its factorization.

1640464601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 1640464601 is about 40502.6493084094. The cubic root of 1640464601 is about 1179.3850575904.

The spelling of 1640464601 in words is "one billion, six hundred forty million, four hundred sixty-four thousand, six hundred one".