66542562 has 24 divisors (see below), whose sum is σ = 144456156. Its totient is φ = 22137696.

The previous prime is 66542561. The next prime is 66542563. The reversal of 66542562 is 26524566.

66542562 is a `hidden beast` number, since 66 + 542 + 56 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (66542561) and next prime (66542563).

It can be written as a sum of positive squares in 2 ways, for example, as 46908801 + 19633761 = 6849^2 + 4431^2 .

It is not an unprimeable number, because it can be changed into a prime (66542561) 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, 6708 + ... + 13344.

Almost surely, 2^66542562 is an apocalyptic number.

66542562 is an abundant number, since it is smaller than the sum of its proper divisors (77913594).

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

66542562 is a wasteful number, since it uses less digits than its factorization.

66542562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202 (or 7199 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 66542562 is about 8157.3624413777. The cubic root of 66542562 is about 405.2283668630.

It can be divided in two parts, 6654 and 2562, that added together give a square (9216 = 96²).

The spelling of 66542562 in words is "sixty-six million, five hundred forty-two thousand, five hundred sixty-two".