851744742065 has 32 divisors (see below), whose sum is σ = 1229658071040. Its totient is φ = 553281624000.

The previous prime is 851744742019. The next prime is 851744742067. The reversal of 851744742065 is 560247447158.

It is a happy number.

It is not a de Polignac number, because 851744742065 - 2²² = 851740547761 is a prime.

It is a super-4 number, since 4×851744742065⁴ (a number of 49 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 851744741998 and 851744742016.

It is not an unprimeable number, because it can be changed into a prime (851744742067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17738840 + ... + 17786790.

It is an arithmetic number, because the mean of its divisors is an integer number (38426814720).

Almost surely, 2^851744742065 is an apocalyptic number.

It is an amenable number.

851744742065 is a deficient number, since it is larger than the sum of its proper divisors (377913328975).

851744742065 is a wasteful number, since it uses less digits than its factorization.

851744742065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74693.

The product of its (nonzero) digits is 7526400, while the sum is 53.

The spelling of 851744742065 in words is "eight hundred fifty-one billion, seven hundred forty-four million, seven hundred forty-two thousand, sixty-five".