66554590 has 16 divisors (see below), whose sum is σ = 120662640. Its totient is φ = 26429760.

The previous prime is 66554581. The next prime is 66554597. The reversal of 66554590 is 9545566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22551 + ... + 25330.

It is an arithmetic number, because the mean of its divisors is an integer number (7541415).

Almost surely, 2^66554590 is an apocalyptic number.

66554590 is a deficient number, since it is larger than the sum of its proper divisors (54108050).

66554590 is a wasteful number, since it uses less digits than its factorization.

66554590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48027.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 66554590 is about 8158.0996561699. The cubic root of 66554590 is about 405.2527812779.

It can be divided in two parts, 665 and 54590, that added together give a palindrome (55255).

The spelling of 66554590 in words is "sixty-six million, five hundred fifty-four thousand, five hundred ninety".