66453867637 has 4 divisors (see below), whose sum is σ = 66680672940. Its totient is φ = 66227062336.

The previous prime is 66453867631. The next prime is 66453867647. The reversal of 66453867637 is 73676835466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59577975396 + 6875892241 = 244086^2 + 82921^2 .

It is a cyclic number.

It is not a de Polignac number, because 66453867637 - 2⁷ = 66453867509 is a prime.

It is a super-2 number, since 2×66453867637² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66453867631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113402212 + ... + 113402797.

It is an arithmetic number, because the mean of its divisors is an integer number (16670168235).

Almost surely, 2^66453867637 is an apocalyptic number.

It is an amenable number.

66453867637 is a deficient number, since it is larger than the sum of its proper divisors (226805303).

66453867637 is a wasteful number, since it uses less digits than its factorization.

66453867637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226805302.

The product of its digits is 91445760, while the sum is 61.

The spelling of 66453867637 in words is "sixty-six billion, four hundred fifty-three million, eight hundred sixty-seven thousand, six hundred thirty-seven".