671627557 has 4 divisors (see below), whose sum is σ = 674303616. Its totient is φ = 668951500.

The previous prime is 671627549. The next prime is 671627573. The reversal of 671627557 is 755726176.

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 671627557 - 2³ = 671627549 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 (671627597) 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, 1337653 + ... + 1338154.

It is an arithmetic number, because the mean of its divisors is an integer number (168575904).

Almost surely, 2^671627557 is an apocalyptic number.

It is an amenable number.

671627557 is a deficient number, since it is larger than the sum of its proper divisors (2676059).

671627557 is a wasteful number, since it uses less digits than its factorization.

671627557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676058.

The product of its digits is 617400, while the sum is 46.

The square root of 671627557 is about 25915.7781476845. The cubic root of 671627557 is about 875.7419804896.

The spelling of 671627557 in words is "six hundred seventy-one million, six hundred twenty-seven thousand, five hundred fifty-seven".