66135572 has 6 divisors (see below), whose sum is σ = 115737258. Its totient is φ = 33067784.

The previous prime is 66135571. The next prime is 66135611. The reversal of 66135572 is 27553166.

It can be written as a sum of positive squares in only one way, i.e., 58920976 + 7214596 = 7676^2 + 2686^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66135571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8266943 + ... + 8266950.

It is an arithmetic number, because the mean of its divisors is an integer number (19289543).

Almost surely, 2^66135572 is an apocalyptic number.

It is an amenable number.

66135572 is a deficient number, since it is larger than the sum of its proper divisors (49601686).

66135572 is a wasteful number, since it uses less digits than its factorization.

66135572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16533897 (or 16533895 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

The square root of 66135572 is about 8132.3780040035. The cubic root of 66135572 is about 404.4005193768.

The spelling of 66135572 in words is "sixty-six million, one hundred thirty-five thousand, five hundred seventy-two".