667405721004277 has 8 divisors (see below), whose sum is σ = 667795554823320. Its totient is φ = 667015925836800.

The previous prime is 667405721004167. The next prime is 667405721004289. The reversal of 667405721004277 is 772400127504766.

It can be written as a sum of positive squares in 4 ways, for example, as 26398571306116 + 641007149698161 = 5137954^2 + 25318119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667405721004277 - 2²³ = 667405712615669 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 (667405721008277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24917793 + ... + 44223385.

It is an arithmetic number, because the mean of its divisors is an integer number (83474444352915).

Almost surely, 2^{667405721004277} is an apocalyptic number.

It is an amenable number.

667405721004277 is a deficient number, since it is larger than the sum of its proper divisors (389833819043).

667405721004277 is a wasteful number, since it uses less digits than its factorization.

667405721004277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19325783.

The product of its (nonzero) digits is 27659520, while the sum is 58.

The spelling of 667405721004277 in words is "six hundred sixty-seven trillion, four hundred five billion, seven hundred twenty-one million, four thousand, two hundred seventy-seven".