66290626 has 4 divisors (see below), whose sum is σ = 99435942. Its totient is φ = 33145312.

The previous prime is 66290621. The next prime is 66290683. The reversal of 66290626 is 62609266.

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., 41280625 + 25010001 = 6425^2 + 5001^2 .

It is not an unprimeable number, because it can be changed into a prime (66290621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16572655 + ... + 16572658.

Almost surely, 2^66290626 is an apocalyptic number.

66290626 is a deficient number, since it is larger than the sum of its proper divisors (33145316).

66290626 is a wasteful number, since it uses less digits than its factorization.

66290626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33145315.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 66290626 is about 8141.9055509137. The cubic root of 66290626 is about 404.7163099926.

The spelling of 66290626 in words is "sixty-six million, two hundred ninety thousand, six hundred twenty-six".