189561497543 has 8 divisors (see below), whose sum is σ = 215785420416. Its totient is φ = 164836084600.

The previous prime is 189561497509. The next prime is 189561497549. The reversal of 189561497543 is 345794165981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189561497543 - 2²⁶ = 189494388679 is a prime.

It is a super-2 number, since 2×189561497543² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189561497549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374627213 + ... + 374627718.

It is an arithmetic number, because the mean of its divisors is an integer number (26973177552).

Almost surely, 2^189561497543 is an apocalyptic number.

189561497543 is a deficient number, since it is larger than the sum of its proper divisors (26223922873).

189561497543 is a wasteful number, since it uses less digits than its factorization.

189561497543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749254965.

The product of its digits is 32659200, while the sum is 62.

The spelling of 189561497543 in words is "one hundred eighty-nine billion, five hundred sixty-one million, four hundred ninety-seven thousand, five hundred forty-three".