69156112561 has 4 divisors (see below), whose sum is σ = 69156931572. Its totient is φ = 69155293552.

The previous prime is 69156112537. The next prime is 69156112601. The reversal of 69156112561 is 16521165196.

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 18415847025 + 50740265536 = 135705^2 + 225256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69156112561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69156112061) 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, 266110 + ... + 457303.

It is an arithmetic number, because the mean of its divisors is an integer number (17289232893).

Almost surely, 2^69156112561 is an apocalyptic number.

It is an amenable number.

69156112561 is a deficient number, since it is larger than the sum of its proper divisors (819011).

69156112561 is an equidigital number, since it uses as much as digits as its factorization.

69156112561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819010.

The product of its digits is 97200, while the sum is 43.

The spelling of 69156112561 in words is "sixty-nine billion, one hundred fifty-six million, one hundred twelve thousand, five hundred sixty-one".