671604553 has 4 divisors (see below), whose sum is σ = 693269248. Its totient is φ = 649939860.

The previous prime is 671604547. The next prime is 671604613. The reversal of 671604553 is 355406176.

671604553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-671604553 is a prime.

It is a super-2 number, since 2×671604553² = 902105351220659618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671604053) 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, 10832301 + ... + 10832362.

It is an arithmetic number, because the mean of its divisors is an integer number (173317312).

Almost surely, 2^671604553 is an apocalyptic number.

It is an amenable number.

671604553 is a deficient number, since it is larger than the sum of its proper divisors (21664695).

671604553 is a wasteful number, since it uses less digits than its factorization.

671604553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21664694.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 671604553 is about 25915.3343215942. The cubic root of 671604553 is about 875.7319819925.

The spelling of 671604553 in words is "six hundred seventy-one million, six hundred four thousand, five hundred fifty-three".