66556216037 has 4 divisors (see below), whose sum is σ = 66557261856. Its totient is φ = 66555170220.

The previous prime is 66556216031. The next prime is 66556216039. The reversal of 66556216037 is 73061265566.

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 66556216037 - 2³⁴ = 49376346853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66556215982 and 66556216000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66556216031) 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, 420803 + ... + 556944.

It is an arithmetic number, because the mean of its divisors is an integer number (16639315464).

Almost surely, 2^66556216037 is an apocalyptic number.

It is an amenable number.

66556216037 is a deficient number, since it is larger than the sum of its proper divisors (1045819).

66556216037 is an equidigital number, since it uses as much as digits as its factorization.

66556216037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045818.

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 66556216037 in words is "sixty-six billion, five hundred fifty-six million, two hundred sixteen thousand, thirty-seven".