667720026752401 has 8 divisors (see below), whose sum is σ = 763108762489920. Its totient is φ = 572331331136688.

The previous prime is 667720026752371. The next prime is 667720026752413. The reversal of 667720026752401 is 104257620027766.

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 667720026752401 - 2¹⁵ = 667720026719633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667720026752431) 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, 48060270 + ... + 60375736.

It is an arithmetic number, because the mean of its divisors is an integer number (95388595311240).

Almost surely, 2^{667720026752401} is an apocalyptic number.

It is an amenable number.

667720026752401 is a deficient number, since it is larger than the sum of its proper divisors (95388735737519).

667720026752401 is a wasteful number, since it uses less digits than its factorization.

667720026752401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20060903.

The product of its (nonzero) digits is 11854080, while the sum is 55.

The spelling of 667720026752401 in words is "six hundred sixty-seven trillion, seven hundred twenty billion, twenty-six million, seven hundred fifty-two thousand, four hundred one".