123471556161 has 4 divisors (see below), whose sum is σ = 164628741552. Its totient is φ = 82314370772.

The previous prime is 123471556147. The next prime is 123471556193. The reversal of 123471556161 is 161655174321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161655174321 = 3 ⋅53885058107.

It is a cyclic number.

It is not a de Polignac number, because 123471556161 - 2¹⁴ = 123471539777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123471556111) 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, 20578592691 + ... + 20578592696.

It is an arithmetic number, because the mean of its divisors is an integer number (41157185388).

Almost surely, 2^123471556161 is an apocalyptic number.

It is an amenable number.

123471556161 is a deficient number, since it is larger than the sum of its proper divisors (41157185391).

123471556161 is an equidigital number, since it uses as much as digits as its factorization.

123471556161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41157185390.

The product of its digits is 151200, while the sum is 42.

The spelling of 123471556161 in words is "one hundred twenty-three billion, four hundred seventy-one million, five hundred fifty-six thousand, one hundred sixty-one".