772217066 has 4 divisors (see below), whose sum is σ = 1158325602. Its totient is φ = 386108532.

The previous prime is 772217063. The next prime is 772217071. The reversal of 772217066 is 660712277.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 690585841 + 81631225 = 26279^2 + 9035^2 .

It is not an unprimeable number, because it can be changed into a prime (772217063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193054265 + ... + 193054268.

Almost surely, 2^772217066 is an apocalyptic number.

772217066 is a deficient number, since it is larger than the sum of its proper divisors (386108536).

772217066 is a wasteful number, since it uses less digits than its factorization.

772217066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386108535.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 772217066 is about 27788.7938925028. The cubic root of 772217066 is about 917.4444936191. Note that the first 4 decimals are identical.

The spelling of 772217066 in words is "seven hundred seventy-two million, two hundred seventeen thousand, sixty-six".