125161065121 has 4 divisors (see below), whose sum is σ = 125162588692. Its totient is φ = 125159541552.

The previous prime is 125161065119. The next prime is 125161065151. The reversal of 125161065121 is 121560161521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121560161521 = 71 ⋅1712114951.

It can be written as a sum of positive squares in 2 ways, for example, as 100007105121 + 25153960000 = 316239^2 + 158600^2 .

It is a cyclic number.

It is not a de Polignac number, because 125161065121 - 2¹ = 125161065119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125161065151) 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, 631086 + ... + 805351.

It is an arithmetic number, because the mean of its divisors is an integer number (31290647173).

Almost surely, 2^125161065121 is an apocalyptic number.

It is an amenable number.

125161065121 is a deficient number, since it is larger than the sum of its proper divisors (1523571).

125161065121 is an equidigital number, since it uses as much as digits as its factorization.

125161065121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523570.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 125161065121 in words is "one hundred twenty-five billion, one hundred sixty-one million, sixty-five thousand, one hundred twenty-one".