185864690721 has 16 divisors (see below), whose sum is σ = 252510208704. Its totient is φ = 121564757184.

The previous prime is 185864690653. The next prime is 185864690729. The reversal of 185864690721 is 127096468581.

It is not a de Polignac number, because 185864690721 - 2¹³ = 185864682529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (185864690729) 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, 5227215 + ... + 5262651.

It is an arithmetic number, because the mean of its divisors is an integer number (15781888044).

Almost surely, 2^185864690721 is an apocalyptic number.

It is an amenable number.

185864690721 is a deficient number, since it is larger than the sum of its proper divisors (66645517983).

185864690721 is a wasteful number, since it uses less digits than its factorization.

185864690721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68480.

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 185864690721 in words is "one hundred eighty-five billion, eight hundred sixty-four million, six hundred ninety thousand, seven hundred twenty-one".