66400453 has 8 divisors (see below), whose sum is σ = 80350272. Its totient is φ = 53566656.

The previous prime is 66400447. The next prime is 66400457. The reversal of 66400453 is 35400466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66400453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66400457) 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, 278875 + ... + 279112.

It is an arithmetic number, because the mean of its divisors is an integer number (10043784).

Almost surely, 2^66400453 is an apocalyptic number.

It is an amenable number.

66400453 is a deficient number, since it is larger than the sum of its proper divisors (13949819).

66400453 is a wasteful number, since it uses less digits than its factorization.

66400453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558011.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66400453 is about 8148.6473110572. The cubic root of 66400453 is about 404.9396912688.

The spelling of 66400453 in words is "sixty-six million, four hundred thousand, four hundred fifty-three".