1686545057 has 4 divisors (see below), whose sum is σ = 1688625456. Its totient is φ = 1684464660.

The previous prime is 1686545041. The next prime is 1686545071. The reversal of 1686545057 is 7505456861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1686545057 - 2⁴ = 1686545041 is a prime.

It is a super-2 number, since 2×1686545057² = 5688868458582266498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686545087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038983 + ... + 1040604.

It is an arithmetic number, because the mean of its divisors is an integer number (422156364).

Almost surely, 2^1686545057 is an apocalyptic number.

It is an amenable number.

1686545057 is a deficient number, since it is larger than the sum of its proper divisors (2080399).

1686545057 is an equidigital number, since it uses as much as digits as its factorization.

1686545057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080398.

The product of its (nonzero) digits is 1008000, while the sum is 47.

The square root of 1686545057 is about 41067.5669720036. The cubic root of 1686545057 is about 1190.3261721534.

The spelling of 1686545057 in words is "one billion, six hundred eighty-six million, five hundred forty-five thousand, fifty-seven".