66400613533 has 4 divisors (see below), whose sum is σ = 66404187040. Its totient is φ = 66397040028.

The previous prime is 66400613431. The next prime is 66400613551. The reversal of 66400613533 is 33531600466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66400613533 - 2²⁹ = 65863742621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66400613492 and 66400613501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66400613563) 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, 1758735 + ... + 1796092.

It is an arithmetic number, because the mean of its divisors is an integer number (16601046760).

Almost surely, 2^66400613533 is an apocalyptic number.

It is an amenable number.

66400613533 is a deficient number, since it is larger than the sum of its proper divisors (3573507).

66400613533 is a wasteful number, since it uses less digits than its factorization.

66400613533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573506.

The product of its (nonzero) digits is 116640, while the sum is 37.

The spelling of 66400613533 in words is "sixty-six billion, four hundred million, six hundred thirteen thousand, five hundred thirty-three".