66455040 has 160 divisors (see below), whose sum is σ = 225387360. Its totient is φ = 16646144.

The previous prime is 66455033. The next prime is 66455069. The reversal of 66455040 is 4055466.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66454989 and 66455007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130306 + ... + 130814.

It is an arithmetic number, because the mean of its divisors is an integer number (1408671).

Almost surely, 2^66455040 is an apocalyptic number.

66455040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112693680).

66455040 is an abundant number, since it is smaller than the sum of its proper divisors (158932320).

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

66455040 is a wasteful number, since it uses less digits than its factorization.

66455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 66455040 is about 8151.9960745820. The cubic root of 66455040 is about 405.0506261968.

The spelling of 66455040 in words is "sixty-six million, four hundred fifty-five thousand, forty".