67312356561 has 8 divisors (see below), whose sum is σ = 99722009760. Its totient is φ = 44874904356.

The previous prime is 67312356521. The next prime is 67312356583. The reversal of 67312356561 is 16565321376.

67312356561 is a `hidden beast` number, since 6 + 7 + 3 + 1 + 23 + 565 + 61 = 666.

It is not a de Polignac number, because 67312356561 - 2¹⁷ = 67312225489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67312356521) 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, 1246525095 + ... + 1246525148.

It is an arithmetic number, because the mean of its divisors is an integer number (12465251220).

Almost surely, 2^67312356561 is an apocalyptic number.

It is an amenable number.

67312356561 is a deficient number, since it is larger than the sum of its proper divisors (32409653199).

67312356561 is a wasteful number, since it uses less digits than its factorization.

67312356561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493050252 (or 2493050246 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The spelling of 67312356561 in words is "sixty-seven billion, three hundred twelve million, three hundred fifty-six thousand, five hundred sixty-one".