66256690 has 8 divisors (see below), whose sum is σ = 119262060. Its totient is φ = 26502672.

The previous prime is 66256661. The next prime is 66256693. The reversal of 66256690 is 9665266.

It can be written as a sum of positive squares in 2 ways, for example, as 60980481 + 5276209 = 7809^2 + 2297^2 .

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

It is a super-2 number, since 2×66256690² = 8779897939512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66256693) 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, 3312825 + ... + 3312844.

Almost surely, 2^66256690 is an apocalyptic number.

66256690 is a deficient number, since it is larger than the sum of its proper divisors (53005370).

66256690 is a wasteful number, since it uses less digits than its factorization.

66256690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6625676.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 66256690 is about 8139.8212511087. The cubic root of 66256690 is about 404.6472363901.

The spelling of 66256690 in words is "sixty-six million, two hundred fifty-six thousand, six hundred ninety".