66405454 has 32 divisors (see below), whose sum is σ = 106528896. Its totient is φ = 31000320.

The previous prime is 66405431. The next prime is 66405473. The reversal of 66405454 is 45450466.

It is a super-2 number, since 2×66405454² = 8819368641892232, 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 15 ways as a sum of consecutive naturals, for example, 212002 + ... + 212314.

It is an arithmetic number, because the mean of its divisors is an integer number (3329028).

Almost surely, 2^66405454 is an apocalyptic number.

66405454 is a deficient number, since it is larger than the sum of its proper divisors (40123442).

66405454 is a wasteful number, since it uses less digits than its factorization.

66405454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 66405454 is about 8148.9541660265. The cubic root of 66405454 is about 404.9498571259.

The spelling of 66405454 in words is "sixty-six million, four hundred five thousand, four hundred fifty-four".