66434455 has 4 divisors (see below), whose sum is σ = 79721352. Its totient is φ = 53147560.

The previous prime is 66434443. The next prime is 66434461. The reversal of 66434455 is 55443466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66434455 - 2¹³ = 66426263 is a prime.

It is a super-2 number, since 2×66434455² = 8827073622294050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643441 + ... + 6643450.

It is an arithmetic number, because the mean of its divisors is an integer number (19930338).

Almost surely, 2^66434455 is an apocalyptic number.

66434455 is a deficient number, since it is larger than the sum of its proper divisors (13286897).

66434455 is a wasteful number, since it uses less digits than its factorization.

66434455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13286896.

The product of its digits is 172800, while the sum is 37.

The square root of 66434455 is about 8150.7334025841. The cubic root of 66434455 is about 405.0087992804.

The spelling of 66434455 in words is "sixty-six million, four hundred thirty-four thousand, four hundred fifty-five".