866051973 has 16 divisors (see below), whose sum is σ = 1304788800. Its totient is φ = 567581040.

The previous prime is 866051971. The next prime is 866051981. The reversal of 866051973 is 379150668.

It is a happy number.

866051973 is a `hidden beast` number, since 8 + 6 + 60 + 519 + 73 = 666.

It is not a de Polignac number, because 866051973 - 2¹ = 866051971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866051971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270238 + ... + 273423.

It is an arithmetic number, because the mean of its divisors is an integer number (81549300).

Almost surely, 2^866051973 is an apocalyptic number.

It is an amenable number.

866051973 is a deficient number, since it is larger than the sum of its proper divisors (438736827).

866051973 is a wasteful number, since it uses less digits than its factorization.

866051973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543729 (or 543723 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 866051973 is about 29428.7609830927. The cubic root of 866051973 is about 953.1940406325.

The spelling of 866051973 in words is "eight hundred sixty-six million, fifty-one thousand, nine hundred seventy-three".