66454989 has 16 divisors (see below), whose sum is σ = 98758080. Its totient is φ = 39502080.

The previous prime is 66454987. The next prime is 66455017. The reversal of 66454989 is 98945466.

It is not a de Polignac number, because 66454989 - 2¹ = 66454987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66454987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33322 + ... + 35259.

It is an arithmetic number, because the mean of its divisors is an integer number (6172380).

Almost surely, 2^66454989 is an apocalyptic number.

It is an amenable number.

66454989 is a deficient number, since it is larger than the sum of its proper divisors (32303091).

66454989 is a wasteful number, since it uses less digits than its factorization.

66454989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68620.

The product of its digits is 1866240, while the sum is 51.

The square root of 66454989 is about 8151.9929465131. The cubic root of 66454989 is about 405.0505225800.

The spelling of 66454989 in words is "sixty-six million, four hundred fifty-four thousand, nine hundred eighty-nine".