667726463036737 has 4 divisors (see below), whose sum is σ = 719090037116500. Its totient is φ = 616362888956976.

The previous prime is 667726463036723. The next prime is 667726463036791. The reversal of 667726463036737 is 737630364627766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126737520466176 + 540988942570561 = 11257776^2 + 23259169^2 .

It is a cyclic number.

It is not a de Polignac number, because 667726463036737 - 2²⁷ = 667726328819009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667726463036737.

It is not an unprimeable number, because it can be changed into a prime (667726463036707) 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, 25681787039862 + ... + 25681787039887.

It is an arithmetic number, because the mean of its divisors is an integer number (179772509279125).

Almost surely, 2^{667726463036737} is an apocalyptic number.

It is an amenable number.

667726463036737 is a deficient number, since it is larger than the sum of its proper divisors (51363574079763).

667726463036737 is a wasteful number, since it uses less digits than its factorization.

667726463036737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51363574079762.

The product of its (nonzero) digits is 4032758016, while the sum is 73.

The spelling of 667726463036737 in words is "six hundred sixty-seven trillion, seven hundred twenty-six billion, four hundred sixty-three million, thirty-six thousand, seven hundred thirty-seven".