670556881 has 8 divisors (see below), whose sum is σ = 701233920. Its totient is φ = 640006752.

The previous prime is 670556867. The next prime is 670556899. The reversal of 670556881 is 188655076.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 670556881 - 2²⁵ = 637002449 is a prime.

It is a super-2 number, since 2×670556881² = 899293061312896322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670556801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20836 + ... + 42133.

It is an arithmetic number, because the mean of its divisors is an integer number (87654240).

Almost surely, 2^670556881 is an apocalyptic number.

It is an amenable number.

670556881 is a deficient number, since it is larger than the sum of its proper divisors (30677039).

670556881 is a wasteful number, since it uses less digits than its factorization.

670556881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63455.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 670556881 is about 25895.1130717748. The cubic root of 670556881 is about 875.2763778912.

The spelling of 670556881 in words is "six hundred seventy million, five hundred fifty-six thousand, eight hundred eighty-one".