851550645 has 64 divisors (see below), whose sum is σ = 1575936000. Its totient is φ = 388304640.

The previous prime is 851550613. The next prime is 851550647. The reversal of 851550645 is 546055158.

It is not a de Polignac number, because 851550645 - 2⁵ = 851550613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851550647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 466204 + ... + 468026.

It is an arithmetic number, because the mean of its divisors is an integer number (24624000).

Almost surely, 2^851550645 is an apocalyptic number.

It is an amenable number.

851550645 is a deficient number, since it is larger than the sum of its proper divisors (724385355).

851550645 is a wasteful number, since it uses less digits than its factorization.

851550645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010.

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 851550645 is about 29181.3406991523. The cubic root of 851550645 is about 947.8439173591.

The spelling of 851550645 in words is "eight hundred fifty-one million, five hundred fifty thousand, six hundred forty-five".