672299861 has 2 divisors, whose sum is σ = 672299862. Its totient is φ = 672299860.

The previous prime is 672299843. The next prime is 672299893. The reversal of 672299861 is 168992276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641051761 + 31248100 = 25319^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 672299861 - 2¹⁴ = 672283477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672299261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336149930 + 336149931.

It is an arithmetic number, because the mean of its divisors is an integer number (336149931).

Almost surely, 2^672299861 is an apocalyptic number.

It is an amenable number.

672299861 is a deficient number, since it is larger than the sum of its proper divisors (1).

672299861 is an equidigital number, since it uses as much as digits as its factorization.

672299861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 672299861 is about 25928.7458431757. The cubic root of 672299861 is about 876.0340910435.

The spelling of 672299861 in words is "six hundred seventy-two million, two hundred ninety-nine thousand, eight hundred sixty-one".