66949455 has 16 divisors (see below), whose sum is σ = 107220960. Its totient is φ = 35672448.

The previous prime is 66949453. The next prime is 66949457. The reversal of 66949455 is 55494966.

It is an interprime number because it is at equal distance from previous prime (66949453) and next prime (66949457).

It is not a de Polignac number, because 66949455 - 2¹ = 66949453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66949453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27841 + ... + 30149.

It is an arithmetic number, because the mean of its divisors is an integer number (6701310).

Almost surely, 2^66949455 is an apocalyptic number.

66949455 is a deficient number, since it is larger than the sum of its proper divisors (40271505).

66949455 is a wasteful number, since it uses less digits than its factorization.

66949455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250.

The product of its digits is 1166400, while the sum is 48.

The square root of 66949455 is about 8182.2646620603. The cubic root of 66949455 is about 406.0526495498.

The spelling of 66949455 in words is "sixty-six million, nine hundred forty-nine thousand, four hundred fifty-five".