189865657451 has 4 divisors (see below), whose sum is σ = 189893846712. Its totient is φ = 189837468192.

The previous prime is 189865657427. The next prime is 189865657477. The reversal of 189865657451 is 154756568981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154756568981 = 7 ⋅22108081283.

It is a cyclic number.

It is not a de Polignac number, because 189865657451 - 2²⁶ = 189798548587 is a prime.

It is a super-3 number, since 3×189865657451³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189865657481) 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, 14084525 + ... + 14097998.

It is an arithmetic number, because the mean of its divisors is an integer number (47473461678).

Almost surely, 2^189865657451 is an apocalyptic number.

189865657451 is a deficient number, since it is larger than the sum of its proper divisors (28189261).

189865657451 is an equidigital number, since it uses as much as digits as its factorization.

189865657451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28189260.

The product of its digits is 72576000, while the sum is 65.

The spelling of 189865657451 in words is "one hundred eighty-nine billion, eight hundred sixty-five million, six hundred fifty-seven thousand, four hundred fifty-one".