66611954 has 8 divisors (see below), whose sum is σ = 100888320. Its totient is φ = 32982516.

The previous prime is 66611953. The next prime is 66611957. The reversal of 66611954 is 45911666.

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

It is not an unprimeable number, because it can be changed into a prime (66611953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161474 + ... + 161885.

It is an arithmetic number, because the mean of its divisors is an integer number (12611040).

Almost surely, 2^66611954 is an apocalyptic number.

66611954 is a deficient number, since it is larger than the sum of its proper divisors (34276366).

66611954 is a wasteful number, since it uses less digits than its factorization.

66611954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323464.

The product of its digits is 38880, while the sum is 38.

The square root of 66611954 is about 8161.6146686792. The cubic root of 66611954 is about 405.3691781827.

The spelling of 66611954 in words is "sixty-six million, six hundred eleven thousand, nine hundred fifty-four".