66154540 has 12 divisors (see below), whose sum is σ = 138924576. Its totient is φ = 26461808.

The previous prime is 66154537. The next prime is 66154553. The reversal of 66154540 is 4545166.

66154540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66154540² = 8752846325223200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1653844 + ... + 1653883.

It is an arithmetic number, because the mean of its divisors is an integer number (11577048).

Almost surely, 2^66154540 is an apocalyptic number.

It is an amenable number.

66154540 is an abundant number, since it is smaller than the sum of its proper divisors (72770036).

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

66154540 is a wasteful number, since it uses less digits than its factorization.

66154540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307736 (or 3307734 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 66154540 is about 8133.5441229516. The cubic root of 66154540 is about 404.4391770191.

The spelling of 66154540 in words is "sixty-six million, one hundred fifty-four thousand, five hundred forty".