186947901961 has 4 divisors (see below), whose sum is σ = 191295527632. Its totient is φ = 182600276292.

The previous prime is 186947901949. The next prime is 186947901967. The reversal of 186947901961 is 169109749681.

186947901961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169109749681 = 41 ⋅4124628041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-186947901961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 186947901961.

It is not an unprimeable number, because it can be changed into a prime (186947901967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2173812771 + ... + 2173812856.

It is an arithmetic number, because the mean of its divisors is an integer number (47823881908).

Almost surely, 2^186947901961 is an apocalyptic number.

It is an amenable number.

186947901961 is a deficient number, since it is larger than the sum of its proper divisors (4347625671).

186947901961 is an equidigital number, since it uses as much as digits as its factorization.

186947901961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347625670.

The product of its (nonzero) digits is 5878656, while the sum is 61.

The spelling of 186947901961 in words is "one hundred eighty-six billion, nine hundred forty-seven million, nine hundred one thousand, nine hundred sixty-one".