664275751 has 2 divisors, whose sum is σ = 664275752. Its totient is φ = 664275750.

The previous prime is 664275709. The next prime is 664275761. The reversal of 664275751 is 157572466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664275751 - 2⁹ = 664275239 is a prime.

It is a super-2 number, since 2×664275751² = 882524546733228002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664275698 and 664275707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664275761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332137875 + 332137876.

It is an arithmetic number, because the mean of its divisors is an integer number (332137876).

Almost surely, 2^664275751 is an apocalyptic number.

664275751 is a deficient number, since it is larger than the sum of its proper divisors (1).

664275751 is an equidigital number, since it uses as much as digits as its factorization.

664275751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The square root of 664275751 is about 25773.5475051457. The cubic root of 664275751 is about 872.5348851825.

The spelling of 664275751 in words is "six hundred sixty-four million, two hundred seventy-five thousand, seven hundred fifty-one".