66445542 has 32 divisors (see below), whose sum is σ = 148318560. Its totient is φ = 22049280.

The previous prime is 66445529. The next prime is 66445553. The reversal of 66445542 is 24554466.

66445542 is a `hidden beast` number, since 6 + 644 + 5 + 5 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66445497 and 66445506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9942 + ... + 15222.

It is an arithmetic number, because the mean of its divisors is an integer number (4634955).

Almost surely, 2^66445542 is an apocalyptic number.

66445542 is an abundant number, since it is smaller than the sum of its proper divisors (81873018).

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

66445542 is a wasteful number, since it uses less digits than its factorization.

66445542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525 (or 5519 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 66445542 is about 8151.4134970568. The cubic root of 66445542 is about 405.0313281664.

The spelling of 66445542 in words is "sixty-six million, four hundred forty-five thousand, five hundred forty-two".