1670691816 has 24 divisors (see below), whose sum is σ = 4524790530. Its totient is φ = 556897248.

The previous prime is 1670691787. The next prime is 1670691823. The reversal of 1670691816 is 6181960761.

It can be written as a sum of positive squares in only one way, i.e., 1613628900 + 57062916 = 40170^2 + 7554^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1670691816² = 5582422288098755712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11601955 + ... + 11602098.

Almost surely, 2^1670691816 is an apocalyptic number.

It is an amenable number.

1670691816 is an abundant number, since it is smaller than the sum of its proper divisors (2854098714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1670691816 is a wasteful number, since it uses less digits than its factorization.

1670691816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23204065 (or 23204058 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1670691816 is about 40874.0971276431. The cubic root of 1670691816 is about 1186.5848025979.

The spelling of 1670691816 in words is "one billion, six hundred seventy million, six hundred ninety-one thousand, eight hundred sixteen".