66575145 has 128 divisors (see below), whose sum is σ = 147087360. Its totient is φ = 24883200.

The previous prime is 66575143. The next prime is 66575147. The reversal of 66575145 is 54157566.

It is an interprime number because it is at equal distance from previous prime (66575143) and next prime (66575147).

It is not a de Polignac number, because 66575145 - 2¹ = 66575143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (66575143) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 440820 + ... + 440970.

It is an arithmetic number, because the mean of its divisors is an integer number (1149120).

Almost surely, 2^66575145 is an apocalyptic number.

66575145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66575145 is an abundant number, since it is smaller than the sum of its proper divisors (80512215).

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

66575145 is a wasteful number, since it uses less digits than its factorization.

66575145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its digits is 126000, while the sum is 39.

The square root of 66575145 is about 8159.3593498509. The cubic root of 66575145 is about 405.2944969758.

The spelling of 66575145 in words is "sixty-six million, five hundred seventy-five thousand, one hundred forty-five".