66121898 has 8 divisors (see below), whose sum is σ = 100663392. Its totient is φ = 32567436.

The previous prime is 66121877. The next prime is 66121901. The reversal of 66121898 is 89812166.

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

It is a zygodrome in base 4.

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, 246590 + ... + 246857.

It is an arithmetic number, because the mean of its divisors is an integer number (12582924).

Almost surely, 2^66121898 is an apocalyptic number.

66121898 is a deficient number, since it is larger than the sum of its proper divisors (34541494).

66121898 is a wasteful number, since it uses less digits than its factorization.

66121898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493516.

The product of its digits is 41472, while the sum is 41.

The square root of 66121898 is about 8131.5372470401. The cubic root of 66121898 is about 404.3726465610.

The spelling of 66121898 in words is "sixty-six million, one hundred twenty-one thousand, eight hundred ninety-eight".