125052646661 has 4 divisors (see below), whose sum is σ = 125849160492. Its totient is φ = 124256132832.

The previous prime is 125052646651. The next prime is 125052646669. The reversal of 125052646661 is 166646250521.

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 79979233636 + 45073413025 = 282806^2 + 212305^2 .

It is a cyclic number.

It is not a de Polignac number, because 125052646661 - 2¹⁸ = 125052384517 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 (125052646669) 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, 398256680 + ... + 398256993.

It is an arithmetic number, because the mean of its divisors is an integer number (31462290123).

Almost surely, 2^125052646661 is an apocalyptic number.

It is an amenable number.

125052646661 is a deficient number, since it is larger than the sum of its proper divisors (796513831).

125052646661 is an equidigital number, since it uses as much as digits as its factorization.

125052646661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796513830.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 125052646661 in words is "one hundred twenty-five billion, fifty-two million, six hundred forty-six thousand, six hundred sixty-one".