1657670671 has 4 divisors (see below), whose sum is σ = 1660574344. Its totient is φ = 1654767000.

The previous prime is 1657670621. The next prime is 1657670687. The reversal of 1657670671 is 1760767561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1657670671 - 2⁷ = 1657670543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657670611) 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, 1450980 + ... + 1452121.

It is an arithmetic number, because the mean of its divisors is an integer number (415143586).

Almost surely, 2^1657670671 is an apocalyptic number.

1657670671 is a deficient number, since it is larger than the sum of its proper divisors (2903673).

1657670671 is an equidigital number, since it uses as much as digits as its factorization.

1657670671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903672.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 1657670671 is about 40714.5019741124. The cubic root of 1657670671 is about 1183.4940654687.

The spelling of 1657670671 in words is "one billion, six hundred fifty-seven million, six hundred seventy thousand, six hundred seventy-one".