851764402385 has 12 divisors (see below), whose sum is σ = 1100751305052. Its totient is φ = 628989756288.

The previous prime is 851764402331. The next prime is 851764402393. The reversal of 851764402385 is 583204467158.

It can be written as a sum of positive squares in 6 ways, for example, as 468462736 + 851295939649 = 21644^2 + 922657^2 .

It is not a de Polignac number, because 851764402385 - 2³⁸ = 576886495441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7383509 + ... + 7497981.

It is an arithmetic number, because the mean of its divisors is an integer number (91729275421).

Almost surely, 2^851764402385 is an apocalyptic number.

It is an amenable number.

851764402385 is a deficient number, since it is larger than the sum of its proper divisors (248986902667).

851764402385 is an frugal number, since it uses more digits than its factorization.

851764402385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228964 (or 114491 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 851764402385 in words is "eight hundred fifty-one billion, seven hundred sixty-four million, four hundred two thousand, three hundred eighty-five".