655438837 has 2 divisors, whose sum is σ = 655438838. Its totient is φ = 655438836.

The previous prime is 655438813. The next prime is 655438841. The reversal of 655438837 is 738834556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635493681 + 19945156 = 25209^2 + 4466^2 .

It is a cyclic number.

It is not a de Polignac number, because 655438837 - 2⁷ = 655438709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655438807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327719418 + 327719419.

It is an arithmetic number, because the mean of its divisors is an integer number (327719419).

Almost surely, 2^655438837 is an apocalyptic number.

It is an amenable number.

655438837 is a deficient number, since it is larger than the sum of its proper divisors (1).

655438837 is an equidigital number, since it uses as much as digits as its factorization.

655438837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 49.

The square root of 655438837 is about 25601.5397388516. The cubic root of 655438837 is about 868.6484660801.

The spelling of 655438837 in words is "six hundred fifty-five million, four hundred thirty-eight thousand, eight hundred thirty-seven".