66979529 has 4 divisors (see below), whose sum is σ = 67041684. Its totient is φ = 66917376.

The previous prime is 66979489. The next prime is 66979543. The reversal of 66979529 is 92597966.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41628304 + 25351225 = 6452^2 + 5035^2 .

It is a cyclic number.

It is not a de Polignac number, because 66979529 - 2¹⁶ = 66913993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66979729) 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, 29432 + ... + 31625.

It is an arithmetic number, because the mean of its divisors is an integer number (16760421).

Almost surely, 2^66979529 is an apocalyptic number.

It is an amenable number.

66979529 is a deficient number, since it is larger than the sum of its proper divisors (62155).

66979529 is a wasteful number, since it uses less digits than its factorization.

66979529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62154.

The product of its digits is 1837080, while the sum is 53.

The square root of 66979529 is about 8184.1022109942. The cubic root of 66979529 is about 406.1134406812.

The spelling of 66979529 in words is "sixty-six million, nine hundred seventy-nine thousand, five hundred twenty-nine".