1660533523 has 4 divisors (see below), whose sum is σ = 1811491128. Its totient is φ = 1509575920.

The previous prime is 1660533517. The next prime is 1660533527. The reversal of 1660533523 is 3253350661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3253350661 = 11 ⋅295759151.

It is a cyclic number.

It is not a de Polignac number, because 1660533523 - 2⁵ = 1660533491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660533527) 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, 75478786 + ... + 75478807.

It is an arithmetic number, because the mean of its divisors is an integer number (452872782).

Almost surely, 2^1660533523 is an apocalyptic number.

1660533523 is a deficient number, since it is larger than the sum of its proper divisors (150957605).

1660533523 is a wasteful number, since it uses less digits than its factorization.

1660533523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150957604.

The product of its (nonzero) digits is 48600, while the sum is 34.

The square root of 1660533523 is about 40749.6444524366. The cubic root of 1660533523 is about 1184.1749847425.

The spelling of 1660533523 in words is "one billion, six hundred sixty million, five hundred thirty-three thousand, five hundred twenty-three".