66644562453 has 32 divisors (see below), whose sum is σ = 105060678912. Its totient is φ = 36785856000.

The previous prime is 66644562451. The next prime is 66644562473. The reversal of 66644562453 is 35426544666.

It is not a de Polignac number, because 66644562453 - 2¹ = 66644562451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66644562396 and 66644562405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644562451) 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, 296226 + ... + 470147.

It is an arithmetic number, because the mean of its divisors is an integer number (3283146216).

Almost surely, 2^66644562453 is an apocalyptic number.

It is an amenable number.

66644562453 is a deficient number, since it is larger than the sum of its proper divisors (38416116459).

66644562453 is a wasteful number, since it uses less digits than its factorization.

66644562453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766525.

The product of its digits is 12441600, while the sum is 51.

The spelling of 66644562453 in words is "sixty-six billion, six hundred forty-four million, five hundred sixty-two thousand, four hundred fifty-three".