665150543 has 4 divisors (see below), whose sum is σ = 665445960. Its totient is φ = 664855128.

The previous prime is 665150509. The next prime is 665150557. The reversal of 665150543 is 345051566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665150543 - 2²⁶ = 598041679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665150743) 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, 144305 + ... + 148842.

It is an arithmetic number, because the mean of its divisors is an integer number (166361490).

Almost surely, 2^665150543 is an apocalyptic number.

665150543 is a deficient number, since it is larger than the sum of its proper divisors (295417).

665150543 is a wasteful number, since it uses less digits than its factorization.

665150543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295416.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 665150543 is about 25790.5126548504. The cubic root of 665150543 is about 872.9177340826.

The spelling of 665150543 in words is "six hundred sixty-five million, one hundred fifty thousand, five hundred forty-three".