851458335025 has 27 divisors (see below), whose sum is σ = 1062770472043. Its totient is φ = 676704273200.

The previous prime is 851458335023. The next prime is 851458335041. The reversal of 851458335025 is 520533854158.

The square root of 851458335025 is 922745.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 306525000609 + 544933334416 = 553647^2 + 738196^2 .

It is not a de Polignac number, because 851458335025 - 2¹ = 851458335023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851458335025.

It is not an unprimeable number, because it can be changed into a prime (851458335023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 825856260 + ... + 825857290.

Almost surely, 2^851458335025 is an apocalyptic number.

851458335025 is the 922745-th square number.

851458335025 is the 461373-rd centered octagonal number.

It is an amenable number.

851458335025 is a deficient number, since it is larger than the sum of its proper divisors (211312137018).

851458335025 is an frugal number, since it uses more digits than its factorization.

851458335025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 49.

Multiplying 851458335025 by its sum of digits (49), we get a square (41721458416225 = 6459215²).

The spelling of 851458335025 in words is "eight hundred fifty-one billion, four hundred fifty-eight million, three hundred thirty-five thousand, twenty-five".