66525040 has 40 divisors (see below), whose sum is σ = 155333808. Its totient is φ = 26496000.

The previous prime is 66525007. The next prime is 66525047. The reversal of 66525040 is 4052566.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18424 + ... + 21736.

Almost surely, 2^66525040 is an apocalyptic number.

It is an amenable number.

66525040 is an abundant number, since it is smaller than the sum of its proper divisors (88808768).

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

66525040 is a wasteful number, since it uses less digits than its factorization.

66525040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577 (or 3571 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66525040 is about 8156.2883715572. The cubic root of 66525040 is about 405.1927954705.

The spelling of 66525040 in words is "sixty-six million, five hundred twenty-five thousand, forty".