667644942 has 8 divisors (see below), whose sum is σ = 1335289896. Its totient is φ = 222548312.

The previous prime is 667644941. The next prime is 667644953. The reversal of 667644942 is 249446766.

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

667644942 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 667644891 and 667644900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667644941) 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, 55637073 + ... + 55637084.

It is an arithmetic number, because the mean of its divisors is an integer number (166911237).

Almost surely, 2^667644942 is an apocalyptic number.

667644942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

667644942 is a wasteful number, since it uses less digits than its factorization.

667644942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111274162.

The product of its digits is 1741824, while the sum is 48.

The square root of 667644942 is about 25838.8262504317. The cubic root of 667644942 is about 874.0075570076.

The spelling of 667644942 in words is "six hundred sixty-seven million, six hundred forty-four thousand, nine hundred forty-two".