1670646999 has 16 divisors (see below), whose sum is σ = 2546405120. Its totient is φ = 954408960.

The previous prime is 1670646893. The next prime is 1670647037. The reversal of 1670646999 is 9996460761.

It is not a de Polignac number, because 1670646999 - 2⁷ = 1670646871 is a prime.

It is a super-2 number, since 2×1670646999² = 5582122790535412002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670646199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101079 + ... + 116439.

It is an arithmetic number, because the mean of its divisors is an integer number (159150320).

Almost surely, 2^1670646999 is an apocalyptic number.

1670646999 is a deficient number, since it is larger than the sum of its proper divisors (875758121).

1670646999 is a wasteful number, since it uses less digits than its factorization.

1670646999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20550.

The product of its (nonzero) digits is 4408992, while the sum is 57.

The square root of 1670646999 is about 40873.5488916732. The cubic root of 1670646999 is about 1186.5741922934.

The spelling of 1670646999 in words is "one billion, six hundred seventy million, six hundred forty-six thousand, nine hundred ninety-nine".