1264646057 has 2 divisors, whose sum is σ = 1264646058. Its totient is φ = 1264646056.

The previous prime is 1264646029. The next prime is 1264646059. The reversal of 1264646057 is 7506464621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656333161 + 608312896 = 25619^2 + 24664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264646057 - 2⁸ = 1264645801 is a prime.

Together with 1264646059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1264646059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632323028 + 632323029.

It is an arithmetic number, because the mean of its divisors is an integer number (632323029).

Almost surely, 2^1264646057 is an apocalyptic number.

It is an amenable number.

1264646057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264646057 is an equidigital number, since it uses as much as digits as its factorization.

1264646057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 1264646057 is about 35561.8623949871. The cubic root of 1264646057 is about 1081.4082158934.

The spelling of 1264646057 in words is "one billion, two hundred sixty-four million, six hundred forty-six thousand, fifty-seven".