1257664307 has 2 divisors, whose sum is σ = 1257664308. Its totient is φ = 1257664306.

The previous prime is 1257664277. The next prime is 1257664337. The reversal of 1257664307 is 7034667521.

It is a balanced prime because it is at equal distance from previous prime (1257664277) and next prime (1257664337).

It is a cyclic number.

It is not a de Polignac number, because 1257664307 - 2¹⁰ = 1257663283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1257664337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628832153 + 628832154.

It is an arithmetic number, because the mean of its divisors is an integer number (628832154).

Almost surely, 2^1257664307 is an apocalyptic number.

1257664307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257664307 is an equidigital number, since it uses as much as digits as its factorization.

1257664307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 1257664307 is about 35463.5630894585. The cubic root of 1257664307 is about 1079.4144937333.

The spelling of 1257664307 in words is "one billion, two hundred fifty-seven million, six hundred sixty-four thousand, three hundred seven".