125512515461 has 4 divisors (see below), whose sum is σ = 125515245900. Its totient is φ = 125509785024.

The previous prime is 125512515449. The next prime is 125512515463. The reversal of 125512515461 is 164515215521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164515215521 = 36277 ⋅4534973.

It can be written as a sum of positive squares in 2 ways, for example, as 90138052900 + 35374462561 = 300230^2 + 188081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125512515461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125512515463) 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, 1295066 + ... + 1388603.

It is an arithmetic number, because the mean of its divisors is an integer number (31378811475).

Almost surely, 2^125512515461 is an apocalyptic number.

It is an amenable number.

125512515461 is a deficient number, since it is larger than the sum of its proper divisors (2730439).

125512515461 is an equidigital number, since it uses as much as digits as its factorization.

125512515461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730438.

The product of its digits is 60000, while the sum is 38.

The spelling of 125512515461 in words is "one hundred twenty-five billion, five hundred twelve million, five hundred fifteen thousand, four hundred sixty-one".