66812742 has 16 divisors (see below), whose sum is σ = 148472880. Its totient is φ = 22270896.

The previous prime is 66812741. The next prime is 66812743. The reversal of 66812742 is 24721866.

It is an interprime number because it is at equal distance from previous prime (66812741) and next prime (66812743).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66812697 and 66812706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66812741) 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, 618583 + ... + 618690.

It is an arithmetic number, because the mean of its divisors is an integer number (9279555).

Almost surely, 2^66812742 is an apocalyptic number.

66812742 is an abundant number, since it is smaller than the sum of its proper divisors (81660138).

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

66812742 is a wasteful number, since it uses less digits than its factorization.

66812742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237284 (or 1237278 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 66812742 is about 8173.9061653533. The cubic root of 66812742 is about 405.7760702257.

The spelling of 66812742 in words is "sixty-six million, eight hundred twelve thousand, seven hundred forty-two".