7664213257 has 2 divisors, whose sum is σ = 7664213258. Its totient is φ = 7664213256.

The previous prime is 7664213251. The next prime is 7664213269. The reversal of 7664213257 is 7523124667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5645418496 + 2018794761 = 75136^2 + 44931^2 .

It is an emirp because it is prime and its reverse (7523124667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7664213257 - 2⁷ = 7664213129 is a prime.

It is not a weakly prime, because it can be changed into another prime (7664213251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832106628 + 3832106629.

It is an arithmetic number, because the mean of its divisors is an integer number (3832106629).

Almost surely, 2^7664213257 is an apocalyptic number.

It is an amenable number.

7664213257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7664213257 is an equidigital number, since it uses as much as digits as its factorization.

7664213257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 7664213257 is about 87545.4924996142. The cubic root of 7664213257 is about 1971.6168760108.

The spelling of 7664213257 in words is "seven billion, six hundred sixty-four million, two hundred thirteen thousand, two hundred fifty-seven".