646444701 has 18 divisors (see below), whose sum is σ = 1086203742. Its totient is φ = 369396720.

The previous prime is 646444697. The next prime is 646444793. The reversal of 646444701 is 107444646.

646444701 is a `hidden beast` number, since 6 + 4 + 644 + 4 + 7 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 490844025 + 155600676 = 22155^2 + 12474^2 .

It is not a de Polignac number, because 646444701 - 2² = 646444697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646444301) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 732490 + ... + 733371.

Almost surely, 2^646444701 is an apocalyptic number.

It is an amenable number.

646444701 is a deficient number, since it is larger than the sum of its proper divisors (439759041).

646444701 is a wasteful number, since it uses less digits than its factorization.

646444701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465881 (or 1465871 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 646444701 is about 25425.2768126524. The cubic root of 646444701 is about 864.6568636879.

The spelling of 646444701 in words is "six hundred forty-six million, four hundred forty-four thousand, seven hundred one".