66963706 has 4 divisors (see below), whose sum is σ = 100445562. Its totient is φ = 33481852.

The previous prime is 66963691. The next prime is 66963709. The reversal of 66963706 is 60736966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60736966 = 2 ⋅30368483.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 7535025 = 7709^2 + 2745^2 .

It is not an unprimeable number, because it can be changed into a prime (66963709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16740925 + ... + 16740928.

Almost surely, 2^66963706 is an apocalyptic number.

66963706 is a deficient number, since it is larger than the sum of its proper divisors (33481856).

66963706 is a wasteful number, since it uses less digits than its factorization.

66963706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33481855.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 66963706 is about 8183.1354626451. The cubic root of 66963706 is about 406.0814585758.

The spelling of 66963706 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred six".