66994546 has 8 divisors (see below), whose sum is σ = 101013084. Its totient is φ = 33323520.

The previous prime is 66994541. The next prime is 66994547. The reversal of 66994546 is 64549966.

It can be written as a sum of positive squares in 2 ways, for example, as 59459521 + 7535025 = 7711^2 + 2745^2 .

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

It is a super-2 number, since 2×66994546² = 8976538387492232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66994546.

It is not an unprimeable number, because it can be changed into a prime (66994541) 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, 86395 + ... + 87166.

Almost surely, 2^66994546 is an apocalyptic number.

66994546 is a deficient number, since it is larger than the sum of its proper divisors (34018538).

66994546 is a wasteful number, since it uses less digits than its factorization.

66994546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173756.

The product of its digits is 1399680, while the sum is 49.

The square root of 66994546 is about 8185.0196090174. The cubic root of 66994546 is about 406.1437890075.

The spelling of 66994546 in words is "sixty-six million, nine hundred ninety-four thousand, five hundred forty-six".