185856400385 has 8 divisors (see below), whose sum is σ = 223052049000. Its totient is φ = 148668874624.

The previous prime is 185856400363. The next prime is 185856400393. The reversal of 185856400385 is 583004658581.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1800814096 + 184055586289 = 42436^2 + 429017^2 .

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 185856400385 - 2²² = 185852206081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1980260 + ... + 2071989.

It is an arithmetic number, because the mean of its divisors is an integer number (27881506125).

Almost surely, 2^185856400385 is an apocalyptic number.

It is an amenable number.

185856400385 is a deficient number, since it is larger than the sum of its proper divisors (37195648615).

185856400385 is an equidigital number, since it uses as much as digits as its factorization.

185856400385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061427.

The product of its (nonzero) digits is 4608000, while the sum is 53.

The spelling of 185856400385 in words is "one hundred eighty-five billion, eight hundred fifty-six million, four hundred thousand, three hundred eighty-five".