66540530 has 48 divisors (see below), whose sum is σ = 140172120. Its totient is φ = 22675968.

The previous prime is 66540521. The next prime is 66540553. The reversal of 66540530 is 3504566.

It can be written as a sum of positive squares in 4 ways, for example, as 65141041 + 1399489 = 8071^2 + 1183^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66540493 and 66540502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111914 + ... + 112506.

Almost surely, 2^66540530 is an apocalyptic number.

66540530 is an abundant number, since it is smaller than the sum of its proper divisors (73631590).

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

66540530 is a wasteful number, since it uses less digits than its factorization.

66540530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 66540530 is about 8157.2378903646. The cubic root of 66540530 is about 405.2242420222.

The spelling of 66540530 in words is "sixty-six million, five hundred forty thousand, five hundred thirty".