1670642287 has 2 divisors, whose sum is σ = 1670642288. Its totient is φ = 1670642286.

The previous prime is 1670642273. The next prime is 1670642341. The reversal of 1670642287 is 7822460761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1670642287 - 2⁷ = 1670642159 is a prime.

It is a super-2 number, since 2×1670642287² = 5582091302225180738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670642587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835321143 + 835321144.

It is an arithmetic number, because the mean of its divisors is an integer number (835321144).

Almost surely, 2^1670642287 is an apocalyptic number.

1670642287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670642287 is an equidigital number, since it uses as much as digits as its factorization.

1670642287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 1670642287 is about 40873.4912504425. The cubic root of 1670642287 is about 1186.5730767291.

The spelling of 1670642287 in words is "one billion, six hundred seventy million, six hundred forty-two thousand, two hundred eighty-seven".