66654998 has 4 divisors (see below), whose sum is σ = 99982500. Its totient is φ = 33327498.

The previous prime is 66654953. The next prime is 66655049. The reversal of 66654998 is 89945666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89945666 = 2 ⋅44972833.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16663748 + ... + 16663751.

It is an arithmetic number, because the mean of its divisors is an integer number (24995625).

Almost surely, 2^66654998 is an apocalyptic number.

66654998 is a deficient number, since it is larger than the sum of its proper divisors (33327502).

66654998 is a wasteful number, since it uses less digits than its factorization.

66654998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33327501.

The product of its digits is 2799360, while the sum is 53.

The square root of 66654998 is about 8164.2512210245. The cubic root of 66654998 is about 405.4564745953.

The spelling of 66654998 in words is "sixty-six million, six hundred fifty-four thousand, nine hundred ninety-eight".