66641544453 has 32 divisors (see below), whose sum is σ = 98391813120. Its totient is φ = 39785437440.

The previous prime is 66641544427. The next prime is 66641544457. The reversal of 66641544453 is 35444514666.

It is not a de Polignac number, because 66641544453 - 2⁵ = 66641544421 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66641544457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553008 + ... + 662646.

It is an arithmetic number, because the mean of its divisors is an integer number (3074744160).

Almost surely, 2^66641544453 is an apocalyptic number.

It is an amenable number.

66641544453 is a deficient number, since it is larger than the sum of its proper divisors (31750268667).

66641544453 is a wasteful number, since it uses less digits than its factorization.

66641544453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109929.

The product of its digits is 4147200, while the sum is 48.

The spelling of 66641544453 in words is "sixty-six billion, six hundred forty-one million, five hundred forty-four thousand, four hundred fifty-three".