761664649 has 2 divisors, whose sum is σ = 761664650. Its totient is φ = 761664648.

The previous prime is 761664599. The next prime is 761664679. The reversal of 761664649 is 946466167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 543216249 + 218448400 = 23307^2 + 14780^2 .

It is a cyclic number.

It is not a de Polignac number, because 761664649 - 2¹⁵ = 761631881 is a prime.

It is not a weakly prime, because it can be changed into another prime (761664679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380832324 + 380832325.

It is an arithmetic number, because the mean of its divisors is an integer number (380832325).

Almost surely, 2^761664649 is an apocalyptic number.

It is an amenable number.

761664649 is a deficient number, since it is larger than the sum of its proper divisors (1).

761664649 is an equidigital number, since it uses as much as digits as its factorization.

761664649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 49.

The square root of 761664649 is about 27598.2725727535. The cubic root of 761664649 is about 913.2463246570.

The spelling of 761664649 in words is "seven hundred sixty-one million, six hundred sixty-four thousand, six hundred forty-nine".