670820881 has 2 divisors, whose sum is σ = 670820882. Its totient is φ = 670820880.

The previous prime is 670820869. The next prime is 670820929. The reversal of 670820881 is 188028076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421686225 + 249134656 = 20535^2 + 15784^2 .

It is a cyclic number.

It is not a de Polignac number, because 670820881 - 2¹⁵ = 670788113 is a prime.

It is a super-2 number, since 2×670820881² = 900001308771232322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_34818808 and since 670820881 and 34818808 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (670820861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335410440 + 335410441.

It is an arithmetic number, because the mean of its divisors is an integer number (335410441).

Almost surely, 2^670820881 is an apocalyptic number.

It is an amenable number.

670820881 is a deficient number, since it is larger than the sum of its proper divisors (1).

670820881 is an equidigital number, since it uses as much as digits as its factorization.

670820881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 670820881 is about 25900.2100570632. The cubic root of 670820881 is about 875.3912290208.

The spelling of 670820881 in words is "six hundred seventy million, eight hundred twenty thousand, eight hundred eighty-one".