66565400437 has 4 divisors (see below), whose sum is σ = 66566525760. Its totient is φ = 66564275116.

The previous prime is 66565400417. The next prime is 66565400459. The reversal of 66565400437 is 73400456566.

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 66565400437 - 2³¹ = 64417916789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565400417) 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, 468703 + ... + 593980.

It is an arithmetic number, because the mean of its divisors is an integer number (16641631440).

Almost surely, 2^66565400437 is an apocalyptic number.

It is an amenable number.

66565400437 is a deficient number, since it is larger than the sum of its proper divisors (1125323).

66565400437 is a wasteful number, since it uses less digits than its factorization.

66565400437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125322.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 66565400437 in words is "sixty-six billion, five hundred sixty-five million, four hundred thousand, four hundred thirty-seven".