666061267237 has 4 divisors (see below), whose sum is σ = 666311763040. Its totient is φ = 665810771436.

The previous prime is 666061267159. The next prime is 666061267271. The reversal of 666061267237 is 732762160666.

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: 732762160666 = 2 ⋅366381080333.

It is a cyclic number.

It is not a de Polignac number, because 666061267237 - 2²³ = 666052878629 is a prime.

It is a super-2 number, since 2×666061267237² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666061261237) 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, 125243913 + ... + 125249230.

It is an arithmetic number, because the mean of its divisors is an integer number (166577940760).

Almost surely, 2^666061267237 is an apocalyptic number.

It is an amenable number.

666061267237 is a deficient number, since it is larger than the sum of its proper divisors (250495803).

666061267237 is a wasteful number, since it uses less digits than its factorization.

666061267237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250495802.

The product of its (nonzero) digits is 4572288, while the sum is 52.

The spelling of 666061267237 in words is "six hundred sixty-six billion, sixty-one million, two hundred sixty-seven thousand, two hundred thirty-seven".