66013226 has 4 divisors (see below), whose sum is σ = 99019842. Its totient is φ = 33006612.

The previous prime is 66013219. The next prime is 66013237. The reversal of 66013226 is 62231066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62231066 = 2 ⋅31115533.

It can be written as a sum of positive squares in only one way, i.e., 63760225 + 2253001 = 7985^2 + 1501^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66013195 and 66013204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16503305 + ... + 16503308.

Almost surely, 2^66013226 is an apocalyptic number.

66013226 is a deficient number, since it is larger than the sum of its proper divisors (33006616).

66013226 is a wasteful number, since it uses less digits than its factorization.

66013226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33006615.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66013226 is about 8124.8523678895. The cubic root of 66013226 is about 404.1509949262.

The spelling of 66013226 in words is "sixty-six million, thirteen thousand, two hundred twenty-six".