66198651 has 8 divisors (see below), whose sum is σ = 88455744. Its totient is φ = 44037000.

The previous prime is 66198647. The next prime is 66198659. The reversal of 66198651 is 15689166.

It is a happy number.

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

It is not a de Polignac number, because 66198651 - 2² = 66198647 is a prime.

It is a super-2 number, since 2×66198651² = 8764522788439602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66198659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22225 + ... + 25026.

It is an arithmetic number, because the mean of its divisors is an integer number (11056968).

Almost surely, 2^66198651 is an apocalyptic number.

66198651 is a deficient number, since it is larger than the sum of its proper divisors (22257093).

66198651 is a wasteful number, since it uses less digits than its factorization.

66198651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47721.

The product of its digits is 77760, while the sum is 42.

The square root of 66198651 is about 8136.2553426008. The cubic root of 66198651 is about 404.5290486681.

The spelling of 66198651 in words is "sixty-six million, one hundred ninety-eight thousand, six hundred fifty-one".