667181295541 has 4 divisors (see below), whose sum is σ = 667743370272. Its totient is φ = 666619220812.

The previous prime is 667181295533. The next prime is 667181295593. The reversal of 667181295541 is 145592181766.

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 667181295541 - 2³ = 667181295533 is a prime.

It is a super-2 number, since 2×667181295541² (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 (667181295941) 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, 281035585 + ... + 281037958.

It is an arithmetic number, because the mean of its divisors is an integer number (166935842568).

Almost surely, 2^667181295541 is an apocalyptic number.

It is an amenable number.

667181295541 is a deficient number, since it is larger than the sum of its proper divisors (562074731).

667181295541 is a wasteful number, since it uses less digits than its factorization.

667181295541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562074730.

The product of its digits is 3628800, while the sum is 55.

The spelling of 667181295541 in words is "six hundred sixty-seven billion, one hundred eighty-one million, two hundred ninety-five thousand, five hundred forty-one".