66623442 has 64 divisors (see below), whose sum is σ = 146966400. Its totient is φ = 20049920.

The previous prime is 66623441. The next prime is 66623467. The reversal of 66623442 is 24432666.

It is not an unprimeable number, because it can be changed into a prime (66623441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372109 + ... + 372287.

It is an arithmetic number, because the mean of its divisors is an integer number (2296350).

Almost surely, 2^66623442 is an apocalyptic number.

66623442 is an abundant number, since it is smaller than the sum of its proper divisors (80342958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66623442 is a wasteful number, since it uses less digits than its factorization.

66623442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its digits is 41472, while the sum is 33.

The square root of 66623442 is about 8162.3184206450. The cubic root of 66623442 is about 405.3924803738.

The spelling of 66623442 in words is "sixty-six million, six hundred twenty-three thousand, four hundred forty-two".