67251507665 has 12 divisors (see below), whose sum is σ = 85172825844. Its totient is φ = 50969562336.

The previous prime is 67251507647. The next prime is 67251507691. The reversal of 67251507665 is 56670515276.

It can be written as a sum of positive squares in 2 ways, for example, as 19832525584 + 47418982081 = 140828^2 + 217759^2 .

It is not a de Polignac number, because 67251507665 - 2³² = 62956540369 is a prime.

It is a super-3 number, since 3×67251507665³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18627422 + ... + 18631031.

It is an arithmetic number, because the mean of its divisors is an integer number (7097735487).

Almost surely, 2^67251507665 is an apocalyptic number.

It is an amenable number.

67251507665 is a deficient number, since it is larger than the sum of its proper divisors (17921318179).

67251507665 is a wasteful number, since it uses less digits than its factorization.

67251507665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37258496 (or 37258477 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 67251507665 in words is "sixty-seven billion, two hundred fifty-one million, five hundred seven thousand, six hundred sixty-five".