851385729025 has 24 divisors (see below), whose sum is σ = 1173602495744. Its totient is φ = 608434459200.

The previous prime is 851385728957. The next prime is 851385729049. The reversal of 851385729025 is 520927583158.

It is not a de Polignac number, because 851385729025 - 2³¹ = 849238245377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42242319 + ... + 42262468.

Almost surely, 2^851385729025 is an apocalyptic number.

It is an amenable number.

851385729025 is a deficient number, since it is larger than the sum of its proper divisors (322216766719).

851385729025 is a wasteful number, since it uses less digits than its factorization.

851385729025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84504841 (or 84504836 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 55.

The spelling of 851385729025 in words is "eight hundred fifty-one billion, three hundred eighty-five million, seven hundred twenty-nine thousand, twenty-five".