766161761 has 2 divisors, whose sum is σ = 766161762. Its totient is φ = 766161760.

The previous prime is 766161731. The next prime is 766161821. The reversal of 766161761 is 167161667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763472161 + 2689600 = 27631^2 + 1640^2 .

It is an emirp because it is prime and its reverse (167161667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 766161761 - 2¹⁰ = 766160737 is a prime.

It is a super-2 number, since 2×766161761² = 1174007688037242242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (766161731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383080880 + 383080881.

It is an arithmetic number, because the mean of its divisors is an integer number (383080881).

Almost surely, 2^766161761 is an apocalyptic number.

It is an amenable number.

766161761 is a deficient number, since it is larger than the sum of its proper divisors (1).

766161761 is an equidigital number, since it uses as much as digits as its factorization.

766161761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 766161761 is about 27679.6271831829. The cubic root of 766161761 is about 915.0401650578.

The spelling of 766161761 in words is "seven hundred sixty-six million, one hundred sixty-one thousand, seven hundred sixty-one".