66220998 has 8 divisors (see below), whose sum is σ = 132442008. Its totient is φ = 22073664.

The previous prime is 66220981. The next prime is 66221003. The reversal of 66220998 is 89902266.

It is a sphenic number, since it is the product of 3 distinct primes.

66220998 is an admirable number.

It is a super-2 number, since 2×66220998² = 8770441152232008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5518411 + ... + 5518422.

It is an arithmetic number, because the mean of its divisors is an integer number (16555251).

Almost surely, 2^66220998 is an apocalyptic number.

66220998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66220998 is a wasteful number, since it uses less digits than its factorization.

66220998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11036838.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 66220998 is about 8137.6285243307. The cubic root of 66220998 is about 404.5745631586.

The spelling of 66220998 in words is "sixty-six million, two hundred twenty thousand, nine hundred ninety-eight".