772131665 has 8 divisors (see below), whose sum is σ = 927291240. Its totient is φ = 617216512.

The previous prime is 772131649. The next prime is 772131677. The reversal of 772131665 is 566131277.

It can be written as a sum of positive squares in 4 ways, for example, as 233845264 + 538286401 = 15292^2 + 23201^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 772131665 - 2⁴ = 772131649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54080 + ... + 66849.

It is an arithmetic number, because the mean of its divisors is an integer number (115911405).

Almost surely, 2^772131665 is an apocalyptic number.

It is an amenable number.

772131665 is a deficient number, since it is larger than the sum of its proper divisors (155159575).

772131665 is a wasteful number, since it uses less digits than its factorization.

772131665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122211.

The product of its digits is 52920, while the sum is 38.

The square root of 772131665 is about 27787.2572414047. The cubic root of 772131665 is about 917.4106717102.

The spelling of 772131665 in words is "seven hundred seventy-two million, one hundred thirty-one thousand, six hundred sixty-five".