1646709897 has 16 divisors (see below), whose sum is σ = 2567628800. Its totient is φ = 919093392.

The previous prime is 1646709893. The next prime is 1646709919. The reversal of 1646709897 is 7989076461.

It is not a de Polignac number, because 1646709897 - 2² = 1646709893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646709893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910897 + ... + 912702.

It is an arithmetic number, because the mean of its divisors is an integer number (160476800).

Almost surely, 2^1646709897 is an apocalyptic number.

It is an amenable number.

1646709897 is a deficient number, since it is larger than the sum of its proper divisors (920918903).

1646709897 is a wasteful number, since it uses less digits than its factorization.

1646709897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823652.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 1646709897 is about 40579.6734461972. The cubic root of 1646709897 is about 1180.8798132974.

The spelling of 1646709897 in words is "one billion, six hundred forty-six million, seven hundred nine thousand, eight hundred ninety-seven".