66554361 has 12 divisors (see below), whose sum is σ = 96318820. Its totient is φ = 44284320.

The previous prime is 66554347. The next prime is 66554381. The reversal of 66554361 is 16345566.

It can be written as a sum of positive squares in 2 ways, for example, as 38675961 + 27878400 = 6219^2 + 5280^2 .

It is not a de Polignac number, because 66554361 - 2¹⁰ = 66553337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66554381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1966 + ... + 11703.

Almost surely, 2^66554361 is an apocalyptic number.

It is an amenable number.

66554361 is a deficient number, since it is larger than the sum of its proper divisors (29764459).

66554361 is a wasteful number, since it uses less digits than its factorization.

66554361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216 (or 14213 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66554361 is about 8158.0856210265. The cubic root of 66554361 is about 405.2523164815.

The spelling of 66554361 in words is "sixty-six million, five hundred fifty-four thousand, three hundred sixty-one".