66757545 has 24 divisors (see below), whose sum is σ = 121804800. Its totient is φ = 33729696.

The previous prime is 66757541. The next prime is 66757567. The reversal of 66757545 is 54575766.

It is not a de Polignac number, because 66757545 - 2² = 66757541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66757545.

It is not an unprimeable number, because it can be changed into a prime (66757541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38185 + ... + 39894.

It is an arithmetic number, because the mean of its divisors is an integer number (5075200).

Almost surely, 2^66757545 is an apocalyptic number.

It is an amenable number.

66757545 is a deficient number, since it is larger than the sum of its proper divisors (55047255).

66757545 is a wasteful number, since it uses less digits than its factorization.

66757545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78109 (or 78106 counting only the distinct ones).

The product of its digits is 882000, while the sum is 45.

The square root of 66757545 is about 8170.5290526379. The cubic root of 66757545 is about 405.6642961748.

The spelling of 66757545 in words is "sixty-six million, seven hundred fifty-seven thousand, five hundred forty-five".