66021054 has 64 divisors (see below), whose sum is σ = 148843008. Its totient is φ = 19353600.

The previous prime is 66021037. The next prime is 66021071. The reversal of 66021054 is 45012066.

It is an interprime number because it is at equal distance from previous prime (66021037) and next prime (66021071).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341982 + ... + 342174.

It is an arithmetic number, because the mean of its divisors is an integer number (2325672).

Almost surely, 2^66021054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66021054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74421504).

66021054 is an abundant number, since it is smaller than the sum of its proper divisors (82821954).

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

66021054 is a wasteful number, since it uses less digits than its factorization.

66021054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66021054 is about 8125.3340854392. The cubic root of 66021054 is about 404.1669693459.

The spelling of 66021054 in words is "sixty-six million, twenty-one thousand, fifty-four".