66801506616237 has 4 divisors (see below), whose sum is σ = 89068675488320. Its totient is φ = 44534337744156.

The previous prime is 66801506616233. The next prime is 66801506616253. The reversal of 66801506616237 is 73261660510866.

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 not a de Polignac number, because 66801506616237 - 2² = 66801506616233 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 (66801506616233) 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, 11133584436037 + ... + 11133584436042.

It is an arithmetic number, because the mean of its divisors is an integer number (22267168872080).

Almost surely, 2^{66801506616237} is an apocalyptic number.

It is an amenable number.

66801506616237 is a deficient number, since it is larger than the sum of its proper divisors (22267168872083).

66801506616237 is a wasteful number, since it uses less digits than its factorization.

66801506616237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22267168872082.

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 66801506616237 in words is "sixty-six trillion, eight hundred one billion, five hundred six million, six hundred sixteen thousand, two hundred thirty-seven".