66111942 has 16 divisors (see below), whose sum is σ = 142395120. Its totient is φ = 20342112.

The previous prime is 66111937. The next prime is 66111943. The reversal of 66111942 is 24911166.

It is a happy number.

It is a super-2 number, since 2×66111942² = 8741577750022728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423717 + ... + 423872.

It is an arithmetic number, because the mean of its divisors is an integer number (8899695).

Almost surely, 2^66111942 is an apocalyptic number.

66111942 is an abundant number, since it is smaller than the sum of its proper divisors (76283178).

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

66111942 is a wasteful number, since it uses less digits than its factorization.

66111942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847607.

The product of its digits is 2592, while the sum is 30.

The square root of 66111942 is about 8130.9250396250. The cubic root of 66111942 is about 404.3523500265.

The spelling of 66111942 in words is "sixty-six million, one hundred eleven thousand, nine hundred forty-two".