66661942 has 8 divisors (see below), whose sum is σ = 100046232. Its totient is φ = 33313200.

The previous prime is 66661897. The next prime is 66661957. The reversal of 66661942 is 24916666.

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

It is a super-2 number, since 2×66661942² = 8887629022422728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66661895 and 66661904.

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, 3559 + ... + 12082.

It is an arithmetic number, because the mean of its divisors is an integer number (12505779).

Almost surely, 2^66661942 is an apocalyptic number.

66661942 is a deficient number, since it is larger than the sum of its proper divisors (33384290).

66661942 is a wasteful number, since it uses less digits than its factorization.

66661942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17774.

The product of its digits is 93312, while the sum is 40.

The square root of 66661942 is about 8164.6764785875. The cubic root of 66661942 is about 405.4705540196.

The spelling of 66661942 in words is "sixty-six million, six hundred sixty-one thousand, nine hundred forty-two".