1641584857 has 32 divisors (see below), whose sum is σ = 1918425600. Its totient is φ = 1400628240.

The previous prime is 1641584849. The next prime is 1641584891. The reversal of 1641584857 is 7584851461.

It is not a de Polignac number, because 1641584857 - 2³ = 1641584849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641584857.

It is not an unprimeable number, because it can be changed into a prime (1641584057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3514938 + ... + 3515404.

It is an arithmetic number, because the mean of its divisors is an integer number (59950800).

Almost surely, 2^1641584857 is an apocalyptic number.

It is an amenable number.

1641584857 is a deficient number, since it is larger than the sum of its proper divisors (276840743).

1641584857 is a wasteful number, since it uses less digits than its factorization.

1641584857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 636 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The square root of 1641584857 is about 40516.4763645606. The cubic root of 1641584857 is about 1179.6534597152.

The spelling of 1641584857 in words is "one billion, six hundred forty-one million, five hundred eighty-four thousand, eight hundred fifty-seven".