66530437837 has 4 divisors (see below), whose sum is σ = 66536411040. Its totient is φ = 66524464636.

The previous prime is 66530437811. The next prime is 66530437861. The reversal of 66530437837 is 73873403566.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73873403566 = 2 ⋅36936701783.

It is a cyclic number.

It is not a de Polignac number, because 66530437837 - 2²⁷ = 66396220109 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 (66530437807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2969863 + ... + 2992180.

It is an arithmetic number, because the mean of its divisors is an integer number (16634102760).

Almost surely, 2^66530437837 is an apocalyptic number.

It is an amenable number.

66530437837 is a deficient number, since it is larger than the sum of its proper divisors (5973203).

66530437837 is a wasteful number, since it uses less digits than its factorization.

66530437837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5973202.

The product of its (nonzero) digits is 7620480, while the sum is 52.

The spelling of 66530437837 in words is "sixty-six billion, five hundred thirty million, four hundred thirty-seven thousand, eight hundred thirty-seven".