66551742 has 24 divisors (see below), whose sum is σ = 150465744. Its totient is φ = 21219264.

The previous prime is 66551741. The next prime is 66551747. The reversal of 66551742 is 24715566.

It is a happy number.

66551742 is a `hidden beast` number, since 66 + 551 + 7 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66551697 and 66551706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79963 + ... + 80790.

It is an arithmetic number, because the mean of its divisors is an integer number (6269406).

Almost surely, 2^66551742 is an apocalyptic number.

66551742 is an abundant number, since it is smaller than the sum of its proper divisors (83914002).

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

66551742 is a wasteful number, since it uses less digits than its factorization.

66551742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160784 (or 160781 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 66551742 is about 8157.9251038484. The cubic root of 66551742 is about 405.2470006779.

The spelling of 66551742 in words is "sixty-six million, five hundred fifty-one thousand, seven hundred forty-two".