666847742 has 8 divisors (see below), whose sum is σ = 1091205432. Its totient is φ = 303112600.

The previous prime is 666847697. The next prime is 666847747. The reversal of 666847742 is 247748666.

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

It is a super-2 number, since 2×666847742² = 889371822020997128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666847747) 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, 15155609 + ... + 15155652.

It is an arithmetic number, because the mean of its divisors is an integer number (136400679).

Almost surely, 2^666847742 is an apocalyptic number.

666847742 is a deficient number, since it is larger than the sum of its proper divisors (424357690).

666847742 is a wasteful number, since it uses less digits than its factorization.

666847742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30311274.

The product of its digits is 2709504, while the sum is 50.

The square root of 666847742 is about 25823.3952453971. The cubic root of 666847742 is about 873.6595495135.

The spelling of 666847742 in words is "six hundred sixty-six million, eight hundred forty-seven thousand, seven hundred forty-two".