670439561 has 4 divisors (see below), whose sum is σ = 731388624. Its totient is φ = 609490500.

The previous prime is 670439551. The next prime is 670439579. The reversal of 670439561 is 165934076.

670439561 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 not a de Polignac number, because 670439561 - 2¹⁴ = 670423177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670439521) 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, 30474515 + ... + 30474536.

It is an arithmetic number, because the mean of its divisors is an integer number (182847156).

Almost surely, 2^670439561 is an apocalyptic number.

It is an amenable number.

670439561 is a deficient number, since it is larger than the sum of its proper divisors (60949063).

670439561 is a wasteful number, since it uses less digits than its factorization.

670439561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60949062.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 670439561 is about 25892.8476803924. The cubic root of 670439561 is about 875.2253290706.

The spelling of 670439561 in words is "six hundred seventy million, four hundred thirty-nine thousand, five hundred sixty-one".