66623434 has 4 divisors (see below), whose sum is σ = 99935154. Its totient is φ = 33311716.

The previous prime is 66623429. The next prime is 66623441. The reversal of 66623434 is 43432666.

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

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 6017209 = 7785^2 + 2453^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66623434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16655857 + ... + 16655860.

Almost surely, 2^66623434 is an apocalyptic number.

66623434 is a deficient number, since it is larger than the sum of its proper divisors (33311720).

66623434 is a wasteful number, since it uses less digits than its factorization.

66623434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33311719.

The product of its digits is 62208, while the sum is 34.

The square root of 66623434 is about 8162.3179305881. The cubic root of 66623434 is about 405.3924641475.

The spelling of 66623434 in words is "sixty-six million, six hundred twenty-three thousand, four hundred thirty-four".