47156344561 has 2 divisors, whose sum is σ = 47156344562. Its totient is φ = 47156344560.

The previous prime is 47156344553. The next prime is 47156344577. The reversal of 47156344561 is 16544365174.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31909034161 + 15247310400 = 178631^2 + 123480^2 .

It is a cyclic number.

It is not a de Polignac number, because 47156344561 - 2³ = 47156344553 is a prime.

It is not a weakly prime, because it can be changed into another prime (47156342561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23578172280 + 23578172281.

It is an arithmetic number, because the mean of its divisors is an integer number (23578172281).

Almost surely, 2^47156344561 is an apocalyptic number.

It is an amenable number.

47156344561 is a deficient number, since it is larger than the sum of its proper divisors (1).

47156344561 is an equidigital number, since it uses as much as digits as its factorization.

47156344561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 46.

The spelling of 47156344561 in words is "forty-seven billion, one hundred fifty-six million, three hundred forty-four thousand, five hundred sixty-one".