664131451 has 2 divisors, whose sum is σ = 664131452. Its totient is φ = 664131450.

The previous prime is 664131427. The next prime is 664131467. The reversal of 664131451 is 154131466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664131451 - 2¹⁹ = 663607163 is a prime.

It is not a weakly prime, because it can be changed into another prime (664131421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332065725 + 332065726.

It is an arithmetic number, because the mean of its divisors is an integer number (332065726).

Almost surely, 2^664131451 is an apocalyptic number.

664131451 is a deficient number, since it is larger than the sum of its proper divisors (1).

664131451 is an equidigital number, since it uses as much as digits as its factorization.

664131451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 664131451 is about 25770.7479712949. The cubic root of 664131451 is about 872.4717006281.

The spelling of 664131451 in words is "six hundred sixty-four million, one hundred thirty-one thousand, four hundred fifty-one".