66954529 has 8 divisors (see below), whose sum is σ = 68343912. Its totient is φ = 65569920.

The previous prime is 66954509. The next prime is 66954553. The reversal of 66954529 is 92545966.

It can be written as a sum of positive squares in 4 ways, for example, as 2634129 + 64320400 = 1623^2 + 8020^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66954529 - 2⁷ = 66954401 is a prime.

It is a super-2 number, since 2×66954529² = 8965817907223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66954509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44469 + ... + 45949.

It is an arithmetic number, because the mean of its divisors is an integer number (8542989).

Almost surely, 2^66954529 is an apocalyptic number.

It is an amenable number.

66954529 is a deficient number, since it is larger than the sum of its proper divisors (1389383).

66954529 is a wasteful number, since it uses less digits than its factorization.

66954529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387.

The product of its digits is 583200, while the sum is 46.

The square root of 66954529 is about 8182.5747170435. The cubic root of 66954529 is about 406.0629073336.

The spelling of 66954529 in words is "sixty-six million, nine hundred fifty-four thousand, five hundred twenty-nine".