66440455 has 8 divisors (see below), whose sum is σ = 79912800. Its totient is φ = 53029536.

The previous prime is 66440447. The next prime is 66440467. The reversal of 66440455 is 55404466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66440455 - 2³ = 66440447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66440455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12940 + ... + 17329.

It is an arithmetic number, because the mean of its divisors is an integer number (9989100).

Almost surely, 2^66440455 is an apocalyptic number.

66440455 is a deficient number, since it is larger than the sum of its proper divisors (13472345).

66440455 is a wasteful number, since it uses less digits than its factorization.

66440455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30713.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 66440455 is about 8151.1014593121. The cubic root of 66440455 is about 405.0209916468.

The spelling of 66440455 in words is "sixty-six million, four hundred forty thousand, four hundred fifty-five".