66158940 has 48 divisors (see below), whose sum is σ = 189560448. Its totient is φ = 17231424.

The previous prime is 66158927. The next prime is 66158941. The reversal of 66158940 is 4985166.

66158940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66158941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10242 + ... + 15401.

It is an arithmetic number, because the mean of its divisors is an integer number (3949176).

Almost surely, 2^66158940 is an apocalyptic number.

66158940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66158940 is an abundant number, since it is smaller than the sum of its proper divisors (123401508).

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

66158940 is a wasteful number, since it uses less digits than its factorization.

66158940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25698 (or 25696 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 66158940 is about 8133.8146032474. The cubic root of 66158940 is about 404.4481433623.

The spelling of 66158940 in words is "sixty-six million, one hundred fifty-eight thousand, nine hundred forty".