66421098240 has 288 divisors, whose sum is σ = 243996695040. Its totient is φ = 15084306432.

The previous prime is 66421098169. The next prime is 66421098253. The reversal of 66421098240 is 4289012466.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 66421098192 and 66421098201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4212291 + ... + 4228029.

Almost surely, 2^66421098240 is an apocalyptic number.

66421098240 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 66421098240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121998347520).

66421098240 is an abundant number, since it is smaller than the sum of its proper divisors (177575596800).

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

66421098240 is a wasteful number, since it uses less digits than its factorization.

66421098240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15927 (or 15913 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 66421098240 in words is "sixty-six billion, four hundred twenty-one million, ninety-eight thousand, two hundred forty".