772865372821 has 8 divisors (see below), whose sum is σ = 779320611864. Its totient is φ = 766435399680.

The previous prime is 772865372809. The next prime is 772865372861. The reversal of 772865372821 is 128273568277.

It can be written as a sum of positive squares in 4 ways, for example, as 4464110596 + 768401262225 = 66814^2 + 876585^2 .

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 772865372821 - 2¹⁵ = 772865340053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772865372801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6255040 + ... + 6377401.

It is an arithmetic number, because the mean of its divisors is an integer number (97415076483).

Almost surely, 2^772865372821 is an apocalyptic number.

It is an amenable number.

772865372821 is a deficient number, since it is larger than the sum of its proper divisors (6455239043).

772865372821 is a wasteful number, since it uses less digits than its factorization.

772865372821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632951.

The product of its digits is 15805440, while the sum is 58.

The spelling of 772865372821 in words is "seven hundred seventy-two billion, eight hundred sixty-five million, three hundred seventy-two thousand, eight hundred twenty-one".