671623566 has 32 divisors (see below), whose sum is σ = 1357655040. Its totient is φ = 221486496.

The previous prime is 671623553. The next prime is 671623567. The reversal of 671623566 is 665326176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671623567) 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, 227995 + ... + 230921.

It is an arithmetic number, because the mean of its divisors is an integer number (42426720).

Almost surely, 2^671623566 is an apocalyptic number.

671623566 is an abundant number, since it is smaller than the sum of its proper divisors (686031474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671623566 is a wasteful number, since it uses less digits than its factorization.

671623566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328.

The product of its digits is 272160, while the sum is 42.

The square root of 671623566 is about 25915.7011481457. The cubic root of 671623566 is about 875.7402458510.

The spelling of 671623566 in words is "six hundred seventy-one million, six hundred twenty-three thousand, five hundred sixty-six".