166042440 has 64 divisors (see below), whose sum is σ = 553478400. Its totient is φ = 44277696.

The previous prime is 166042439. The next prime is 166042447. The reversal of 166042440 is 44240661.

166042440 is a `hidden beast` number, since 16 + 604 + 2 + 4 + 40 = 666.

166042440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (166042447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75792 + ... + 77951.

It is an arithmetic number, because the mean of its divisors is an integer number (8648100).

Almost surely, 2^166042440 is an apocalyptic number.

166042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166042440 is an abundant number, since it is smaller than the sum of its proper divisors (387435960).

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

166042440 is a wasteful number, since it uses less digits than its factorization.

166042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153763 (or 153753 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 166042440 is about 12885.7456128856. The cubic root of 166042440 is about 549.6332982629.

It can be divided in two parts, 16604 and 2440, that added together give a square (19044 = 138²).

The spelling of 166042440 in words is "one hundred sixty-six million, forty-two thousand, four hundred forty".