666497742 has 16 divisors (see below), whose sum is σ = 1333454160. Its totient is φ = 222089472.

The previous prime is 666497731. The next prime is 666497743. The reversal of 666497742 is 247794666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666497743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488 + ... + 36540.

It is an arithmetic number, because the mean of its divisors is an integer number (83340885).

Almost surely, 2^666497742 is an apocalyptic number.

666497742 is an abundant number, since it is smaller than the sum of its proper divisors (666956418).

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

666497742 is a wasteful number, since it uses less digits than its factorization.

666497742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38227.

The product of its digits is 3048192, while the sum is 51.

The square root of 666497742 is about 25816.6175553654. The cubic root of 666497742 is about 873.5066738590.

The spelling of 666497742 in words is "six hundred sixty-six million, four hundred ninety-seven thousand, seven hundred forty-two".