185985057481 has 4 divisors (see below), whose sum is σ = 194071364352. Its totient is φ = 177898750612.

The previous prime is 185985057451. The next prime is 185985057487. The reversal of 185985057481 is 184750589581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 185985057481 - 2³¹ = 183837573833 is a prime.

It is a super-2 number, since 2×185985057481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185985057487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4043153401 + ... + 4043153446.

It is an arithmetic number, because the mean of its divisors is an integer number (48517841088).

Almost surely, 2^185985057481 is an apocalyptic number.

It is an amenable number.

185985057481 is a deficient number, since it is larger than the sum of its proper divisors (8086306871).

185985057481 is an equidigital number, since it uses as much as digits as its factorization.

185985057481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8086306870.

The product of its (nonzero) digits is 16128000, while the sum is 61.

The spelling of 185985057481 in words is "one hundred eighty-five billion, nine hundred eighty-five million, fifty-seven thousand, four hundred eighty-one".