66611642 has 8 divisors (see below), whose sum is σ = 100588500. Its totient is φ = 33082144.

The previous prime is 66611641. The next prime is 66611651. The reversal of 66611642 is 24611666.

It can be written as a sum of positive squares in 2 ways, for example, as 63984001 + 2627641 = 7999^2 + 1621^2 .

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

It is a super-2 number, since 2×66611642² = 8874221699872328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66611599 and 66611608.

It is not an unprimeable number, because it can be changed into a prime (66611641) 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, 111467 + ... + 112062.

Almost surely, 2^66611642 is an apocalyptic number.

66611642 is a deficient number, since it is larger than the sum of its proper divisors (33976858).

66611642 is a wasteful number, since it uses less digits than its factorization.

66611642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223680.

The product of its digits is 10368, while the sum is 32.

The square root of 66611642 is about 8161.5955547920. The cubic root of 66611642 is about 405.3685452864.

The spelling of 66611642 in words is "sixty-six million, six hundred eleven thousand, six hundred forty-two".