667565612501 has 2 divisors, whose sum is σ = 667565612502. Its totient is φ = 667565612500.

The previous prime is 667565612479. The next prime is 667565612563. The reversal of 667565612501 is 105216565766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518414400100 + 149151212401 = 720010^2 + 386201^2 .

It is a cyclic number.

It is not a de Polignac number, because 667565612501 - 2²² = 667561418197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 667565612501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667565612101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333782806250 + 333782806251.

It is an arithmetic number, because the mean of its divisors is an integer number (333782806251).

Almost surely, 2^667565612501 is an apocalyptic number.

It is an amenable number.

667565612501 is a deficient number, since it is larger than the sum of its proper divisors (1).

667565612501 is an equidigital number, since it uses as much as digits as its factorization.

667565612501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 667565612501 in words is "six hundred sixty-seven billion, five hundred sixty-five million, six hundred twelve thousand, five hundred one".