66354398 has 16 divisors (see below), whose sum is σ = 108743040. Its totient is φ = 30115800.

The previous prime is 66354377. The next prime is 66354413. The reversal of 66354398 is 89345366.

It is a super-2 number, since 2×66354398² = 8805812267884808, 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 7 ways as a sum of consecutive naturals, for example, 15983 + ... + 19701.

It is an arithmetic number, because the mean of its divisors is an integer number (6796440).

Almost surely, 2^66354398 is an apocalyptic number.

66354398 is a deficient number, since it is larger than the sum of its proper divisors (42388642).

66354398 is a wasteful number, since it uses less digits than its factorization.

66354398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543.

The product of its digits is 466560, while the sum is 44.

The square root of 66354398 is about 8145.8208917211. The cubic root of 66354398 is about 404.8460482788.

The spelling of 66354398 in words is "sixty-six million, three hundred fifty-four thousand, three hundred ninety-eight".