66141440 has 36 divisors (see below), whose sum is σ = 158432484. Its totient is φ = 26456064.

The previous prime is 66141437. The next prime is 66141443. The reversal of 66141440 is 4414166.

It is an interprime number because it is at equal distance from previous prime (66141437) and next prime (66141443).

It can be written as a sum of positive squares in 2 ways, for example, as 50013184 + 16128256 = 7072^2 + 4016^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66141443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24557 + ... + 27116.

Almost surely, 2^66141440 is an apocalyptic number.

It is an amenable number.

66141440 is an abundant number, since it is smaller than the sum of its proper divisors (92291044).

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

66141440 is an equidigital number, since it uses as much as digits as its factorization.

66141440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51694 (or 51680 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 66141440 is about 8132.7387760828. The cubic root of 66141440 is about 404.4124794159.

The spelling of 66141440 in words is "sixty-six million, one hundred forty-one thousand, four hundred forty".