66254540 has 48 divisors (see below), whose sum is σ = 154302624. Its totient is φ = 23692800.

The previous prime is 66254521. The next prime is 66254557. The reversal of 66254540 is 4545266.

It is a super-2 number, since 2×66254540² = 8779328141223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66254497 and 66254506.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10952 + ... + 15888.

It is an arithmetic number, because the mean of its divisors is an integer number (3214638).

Almost surely, 2^66254540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66254540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77151312).

66254540 is an abundant number, since it is smaller than the sum of its proper divisors (88048084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66254540 is a wasteful number, since it uses less digits than its factorization.

66254540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018 (or 5016 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 66254540 is about 8139.6891832551. The cubic root of 66254540 is about 404.6428594687.

The spelling of 66254540 in words is "sixty-six million, two hundred fifty-four thousand, five hundred forty".