66699537 has 8 divisors (see below), whose sum is σ = 89932320. Its totient is φ = 43966560.

The previous prime is 66699509. The next prime is 66699541. The reversal of 66699537 is 73599666.

66699537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66699537 - 2¹¹ = 66697489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66699537.

It is not an unprimeable number, because it can be changed into a prime (66699587) 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 7 ways as a sum of consecutive naturals, for example, 124639 + ... + 125172.

It is an arithmetic number, because the mean of its divisors is an integer number (11241540).

Almost surely, 2^66699537 is an apocalyptic number.

It is an amenable number.

66699537 is a deficient number, since it is larger than the sum of its proper divisors (23232783).

66699537 is a wasteful number, since it uses less digits than its factorization.

66699537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249903.

The product of its digits is 1837080, while the sum is 51.

The square root of 66699537 is about 8166.9784498308. The cubic root of 66699537 is about 405.5467634243.

The spelling of 66699537 in words is "sixty-six million, six hundred ninety-nine thousand, five hundred thirty-seven".