186661630641 has 4 divisors (see below), whose sum is σ = 248882174192. Its totient is φ = 124441087092.

The previous prime is 186661630513. The next prime is 186661630663. The reversal of 186661630641 is 146036166681.

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 not a de Polignac number, because 186661630641 - 2⁷ = 186661630513 is a prime.

It is a super-2 number, since 2×186661630641² (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 (186661630681) 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, 31110271771 + ... + 31110271776.

It is an arithmetic number, because the mean of its divisors is an integer number (62220543548).

Almost surely, 2^186661630641 is an apocalyptic number.

It is an amenable number.

186661630641 is a deficient number, since it is larger than the sum of its proper divisors (62220543551).

186661630641 is an equidigital number, since it uses as much as digits as its factorization.

186661630641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62220543550.

The product of its (nonzero) digits is 746496, while the sum is 48.

The spelling of 186661630641 in words is "one hundred eighty-six billion, six hundred sixty-one million, six hundred thirty thousand, six hundred forty-one".