776661506 has 4 divisors (see below), whose sum is σ = 1164992262. Its totient is φ = 388330752.

The previous prime is 776661503. The next prime is 776661551. The reversal of 776661506 is 605166677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605166677 = 163 ⋅3712679.

It can be written as a sum of positive squares in only one way, i.e., 741745225 + 34916281 = 27235^2 + 5909^2 .

It is not an unprimeable number, because it can be changed into a prime (776661503) 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, 194165375 + ... + 194165378.

Almost surely, 2^776661506 is an apocalyptic number.

776661506 is a deficient number, since it is larger than the sum of its proper divisors (388330756).

776661506 is a wasteful number, since it uses less digits than its factorization.

776661506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388330755.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 776661506 is about 27868.6473658124. The cubic root of 776661506 is about 919.2012230255.

The spelling of 776661506 in words is "seven hundred seventy-six million, six hundred sixty-one thousand, five hundred six".