189866457629 has 4 divisors (see below), whose sum is σ = 193448843676. Its totient is φ = 186284071584.

The previous prime is 189866457611. The next prime is 189866457637. The reversal of 189866457629 is 926754668981.

189866457629 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 an emirpimes, since its reverse is a distinct semiprime: 926754668981 = 285767 ⋅3243043.

It can be written as a sum of positive squares in 2 ways, for example, as 61304769604 + 128561688025 = 247598^2 + 358555^2 .

It is a cyclic number.

It is not a de Polignac number, because 189866457629 - 2²⁰ = 189865409053 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189866450629) 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, 1791192944 + ... + 1791193049.

It is an arithmetic number, because the mean of its divisors is an integer number (48362210919).

Almost surely, 2^189866457629 is an apocalyptic number.

It is an amenable number.

189866457629 is a deficient number, since it is larger than the sum of its proper divisors (3582386047).

189866457629 is an equidigital number, since it uses as much as digits as its factorization.

189866457629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582386046.

The product of its digits is 313528320, while the sum is 71.

The spelling of 189866457629 in words is "one hundred eighty-nine billion, eight hundred sixty-six million, four hundred fifty-seven thousand, six hundred twenty-nine".