851666851751 has 8 divisors (see below), whose sum is σ = 901798297920. Its totient is φ = 801539116288.

The previous prime is 851666851729. The next prime is 851666851787. The reversal of 851666851751 is 157158666158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 851666851751 - 2¹⁴ = 851666835367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851666856751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448046 + ... + 1379883.

It is an arithmetic number, because the mean of its divisors is an integer number (112724787240).

Almost surely, 2^851666851751 is an apocalyptic number.

851666851751 is a deficient number, since it is larger than the sum of its proper divisors (50131446169).

851666851751 is a wasteful number, since it uses less digits than its factorization.

851666851751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855353.

The product of its digits is 12096000, while the sum is 59.

The spelling of 851666851751 in words is "eight hundred fifty-one billion, six hundred sixty-six million, eight hundred fifty-one thousand, seven hundred fifty-one".