66037503791 has 24 divisors (see below), whose sum is σ = 80509453920. Its totient is φ = 53905908672.

The previous prime is 66037503781. The next prime is 66037503803. The reversal of 66037503791 is 19730573066.

66037503791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66037503791 - 2¹⁴ = 66037487407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66037503781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130145 + ... + 386021.

It is an arithmetic number, because the mean of its divisors is an integer number (3354560580).

Almost surely, 2^66037503791 is an apocalyptic number.

66037503791 is a deficient number, since it is larger than the sum of its proper divisors (14471950129).

66037503791 is a wasteful number, since it uses less digits than its factorization.

66037503791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256143 (or 256136 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 47.

The spelling of 66037503791 in words is "sixty-six billion, thirty-seven million, five hundred three thousand, seven hundred ninety-one".