1665979524 has 72 divisors (see below), whose sum is σ = 4602229632. Its totient is φ = 503945280.

The previous prime is 1665979499. The next prime is 1665979529. The reversal of 1665979524 is 4259795661.

1665979524 is a `hidden beast` number, since 1 + 66 + 59 + 7 + 9 + 524 = 666.

It is not an unprimeable number, because it can be changed into a prime (1665979529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239317 + ... + 246179.

It is an arithmetic number, because the mean of its divisors is an integer number (63919856).

Almost surely, 2^1665979524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665979524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2301114816).

1665979524 is an abundant number, since it is smaller than the sum of its proper divisors (2936250108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665979524 is a wasteful number, since it uses less digits than its factorization.

1665979524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7497 (or 7492 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The square root of 1665979524 is about 40816.4124342157. The cubic root of 1665979524 is about 1185.4681395557.

It can be divided in two parts, 166597 and 9524, that added together give a triangular number (176121 = T₅₉₃).

The spelling of 1665979524 in words is "one billion, six hundred sixty-five million, nine hundred seventy-nine thousand, five hundred twenty-four".