771766066 has 4 divisors (see below), whose sum is σ = 1157649102. Its totient is φ = 385883032.

The previous prime is 771766063. The next prime is 771766123. The reversal of 771766066 is 660667177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660667177 = 5569 ⋅118633.

It can be written as a sum of positive squares in only one way, i.e., 492174225 + 279591841 = 22185^2 + 16721^2 .

It is not an unprimeable number, because it can be changed into a prime (771766063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192941515 + ... + 192941518.

Almost surely, 2^771766066 is an apocalyptic number.

771766066 is a deficient number, since it is larger than the sum of its proper divisors (385883036).

771766066 is a wasteful number, since it uses less digits than its factorization.

771766066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385883035.

The product of its (nonzero) digits is 444528, while the sum is 46.

The square root of 771766066 is about 27780.6779254935. The cubic root of 771766066 is about 917.2658529828.

The spelling of 771766066 in words is "seven hundred seventy-one million, seven hundred sixty-six thousand, sixty-six".