66254581 has 8 divisors (see below), whose sum is σ = 68304960. Its totient is φ = 64235232.

The previous prime is 66254579. The next prime is 66254597. The reversal of 66254581 is 18545266.

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

It is a cyclic number.

It is not a de Polignac number, because 66254581 - 2¹ = 66254579 is a prime.

It is a super-2 number, since 2×66254581² = 8779339006971122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66254581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66254521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3385 + ... + 11998.

It is an arithmetic number, because the mean of its divisors is an integer number (8538120).

Almost surely, 2^66254581 is an apocalyptic number.

It is an amenable number.

66254581 is a deficient number, since it is larger than the sum of its proper divisors (2050379).

66254581 is a wasteful number, since it uses less digits than its factorization.

66254581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15515.

The product of its digits is 57600, while the sum is 37.

The square root of 66254581 is about 8139.6917017784. The cubic root of 66254581 is about 404.6429429365.

The spelling of 66254581 in words is "sixty-six million, two hundred fifty-four thousand, five hundred eighty-one".