667726063545 has 16 divisors (see below), whose sum is σ = 1068373576512. Its totient is φ = 356116608960.

The previous prime is 667726063481. The next prime is 667726063549. The reversal of 667726063545 is 545360627766.

It is not a de Polignac number, because 667726063545 - 2⁶ = 667726063481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667726063549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1584879 + ... + 1961451.

It is an arithmetic number, because the mean of its divisors is an integer number (66773348532).

Almost surely, 2^667726063545 is an apocalyptic number.

It is an amenable number.

667726063545 is a deficient number, since it is larger than the sum of its proper divisors (400647512967).

667726063545 is a wasteful number, since it uses less digits than its factorization.

667726063545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494792.

The product of its (nonzero) digits is 38102400, while the sum is 57.

The spelling of 667726063545 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, sixty-three thousand, five hundred forty-five".