66315940 has 24 divisors (see below), whose sum is σ = 139531392. Its totient is φ = 26475360.

The previous prime is 66315911. The next prime is 66315943. The reversal of 66315940 is 4951366.

It is a junction number, because it is equal to n+sod(n) for n = 66315896 and 66315905.

It is not an unprimeable number, because it can be changed into a prime (66315943) 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, 8517 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (5813808).

Almost surely, 2^66315940 is an apocalyptic number.

It is an amenable number.

66315940 is an abundant number, since it is smaller than the sum of its proper divisors (73215452).

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

66315940 is a wasteful number, since it uses less digits than its factorization.

66315940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66315940 is about 8143.4599526246. The cubic root of 66315940 is about 404.7678189590.

The spelling of 66315940 in words is "sixty-six million, three hundred fifteen thousand, nine hundred forty".