66542265 has 48 divisors (see below), whose sum is σ = 119283840. Its totient is φ = 34298880.

The previous prime is 66542251. The next prime is 66542279. The reversal of 66542265 is 56224566.

It is an interprime number because it is at equal distance from previous prime (66542251) and next prime (66542279).

It is not a de Polignac number, because 66542265 - 2⁷ = 66542137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 188329 + ... + 188681.

It is an arithmetic number, because the mean of its divisors is an integer number (2485080).

Almost surely, 2^66542265 is an apocalyptic number.

It is an amenable number.

66542265 is a deficient number, since it is larger than the sum of its proper divisors (52741575).

66542265 is a wasteful number, since it uses less digits than its factorization.

66542265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 491 counting only the distinct ones).

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

The square root of 66542265 is about 8157.3442369438. The cubic root of 66542265 is about 405.2277639757.

The spelling of 66542265 in words is "sixty-six million, five hundred forty-two thousand, two hundred sixty-five".