1670684561 has 16 divisors (see below), whose sum is σ = 2060682624. Its totient is φ = 1318996224.

The previous prime is 1670684539. The next prime is 1670684579. The reversal of 1670684561 is 1654860761.

It is not a de Polignac number, because 1670684561 - 2²² = 1666490257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1670684161) 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, 22841 + ... + 62153.

It is an arithmetic number, because the mean of its divisors is an integer number (128792664).

Almost surely, 2^1670684561 is an apocalyptic number.

It is an amenable number.

1670684561 is a deficient number, since it is larger than the sum of its proper divisors (389998063).

1670684561 is a wasteful number, since it uses less digits than its factorization.

1670684561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39800.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1670684561 is about 40874.0083794090. The cubic root of 1670684561 is about 1186.5830850090.

The spelling of 1670684561 in words is "one billion, six hundred seventy million, six hundred eighty-four thousand, five hundred sixty-one".