646400701 has 2 divisors, whose sum is σ = 646400702. Its totient is φ = 646400700.

The previous prime is 646400659. The next prime is 646400719. The reversal of 646400701 is 107004646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413105625 + 233295076 = 20325^2 + 15274^2 .

It is a cyclic number.

It is not a de Polignac number, because 646400701 - 2¹⁵ = 646367933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646400701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646400731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323200350 + 323200351.

It is an arithmetic number, because the mean of its divisors is an integer number (323200351).

Almost surely, 2^646400701 is an apocalyptic number.

It is an amenable number.

646400701 is a deficient number, since it is larger than the sum of its proper divisors (1).

646400701 is an equidigital number, since it uses as much as digits as its factorization.

646400701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 646400701 is about 25424.4115172800. The cubic root of 646400701 is about 864.6372457349.

The spelling of 646400701 in words is "six hundred forty-six million, four hundred thousand, seven hundred one".