66320626 has 4 divisors (see below), whose sum is σ = 99480942. Its totient is φ = 33160312.

The previous prime is 66320623. The next prime is 66320627. The reversal of 66320626 is 62602366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 1437601 = 8055^2 + 1199^2 .

It is not an unprimeable number, because it can be changed into a prime (66320623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16580155 + ... + 16580158.

Almost surely, 2^66320626 is an apocalyptic number.

66320626 is a deficient number, since it is larger than the sum of its proper divisors (33160316).

66320626 is a wasteful number, since it uses less digits than its factorization.

66320626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33160315.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 66320626 is about 8143.7476630849. The cubic root of 66320626 is about 404.7773526012. Note that the first 3 decimals are identical.

The spelling of 66320626 in words is "sixty-six million, three hundred twenty thousand, six hundred twenty-six".