761907661 has 2 divisors, whose sum is σ = 761907662. Its totient is φ = 761907660.

The previous prime is 761907527. The next prime is 761907667. The reversal of 761907661 is 166709167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408242025 + 353665636 = 20205^2 + 18806^2 .

It is an emirp because it is prime and its reverse (166709167) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 761907661 - 2²¹ = 759810509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (761907667) 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, 380953830 + 380953831.

It is an arithmetic number, because the mean of its divisors is an integer number (380953831).

Almost surely, 2^761907661 is an apocalyptic number.

It is an amenable number.

761907661 is a deficient number, since it is larger than the sum of its proper divisors (1).

761907661 is an equidigital number, since it uses as much as digits as its factorization.

761907661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 761907661 is about 27602.6748884959. The cubic root of 761907661 is about 913.3434392326.

The spelling of 761907661 in words is "seven hundred sixty-one million, nine hundred seven thousand, six hundred sixty-one".