66254661 has 24 divisors (see below), whose sum is σ = 110545344. Its totient is φ = 37791360.

The previous prime is 66254659. The next prime is 66254663. The reversal of 66254661 is 16645266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66254659) and next prime (66254663).

It is not a de Polignac number, because 66254661 - 2¹ = 66254659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66254663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18001 + ... + 21366.

It is an arithmetic number, because the mean of its divisors is an integer number (4606056).

Almost surely, 2^66254661 is an apocalyptic number.

It is an amenable number.

66254661 is a deficient number, since it is larger than the sum of its proper divisors (44290683).

66254661 is a wasteful number, since it uses less digits than its factorization.

66254661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39401 (or 39398 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66254661 is about 8139.6966159679. The cubic root of 66254661 is about 404.6431058003.

The spelling of 66254661 in words is "sixty-six million, two hundred fifty-four thousand, six hundred sixty-one".