766541669 has 2 divisors, whose sum is σ = 766541670. Its totient is φ = 766541668.

The previous prime is 766541639. The next prime is 766541813. The reversal of 766541669 is 966145667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658589569 + 107952100 = 25663^2 + 10390^2 .

It is a cyclic number.

It is not a de Polignac number, because 766541669 - 2¹² = 766537573 is a prime.

It is a super-2 number, since 2×766541669² = 1175172260626611122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766541609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383270834 + 383270835.

It is an arithmetic number, because the mean of its divisors is an integer number (383270835).

Almost surely, 2^766541669 is an apocalyptic number.

It is an amenable number.

766541669 is a deficient number, since it is larger than the sum of its proper divisors (1).

766541669 is an equidigital number, since it uses as much as digits as its factorization.

766541669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 766541669 is about 27686.4889251057. The cubic root of 766541669 is about 915.1913836185.

The spelling of 766541669 in words is "seven hundred sixty-six million, five hundred forty-one thousand, six hundred sixty-nine".