66994954 has 8 divisors (see below), whose sum is σ = 108222660. Its totient is φ = 30920736.

The previous prime is 66994951. The next prime is 66994973. The reversal of 66994954 is 45949966.

It can be written as a sum of positive squares in 2 ways, for example, as 66994225 + 729 = 8185^2 + 27^2 .

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

It is a super-2 number, since 2×66994954² = 8976647722924232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66994951) 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, 1288339 + ... + 1288390.

Almost surely, 2^66994954 is an apocalyptic number.

66994954 is a deficient number, since it is larger than the sum of its proper divisors (41227706).

66994954 is a wasteful number, since it uses less digits than its factorization.

66994954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576744.

The product of its digits is 2099520, while the sum is 52.

The square root of 66994954 is about 8185.0445325606. The cubic root of 66994954 is about 406.1446134842.

The spelling of 66994954 in words is "sixty-six million, nine hundred ninety-four thousand, nine hundred fifty-four".