12651542501 has 4 divisors (see below), whose sum is σ = 13624738092. Its totient is φ = 11678346912.

The previous prime is 12651542479. The next prime is 12651542503. The reversal of 12651542501 is 10524515621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10524515621 = 271 ⋅38835851.

It can be written as a sum of positive squares in 2 ways, for example, as 2155744900 + 10495797601 = 46430^2 + 102449^2 .

It is a cyclic number.

It is not a de Polignac number, because 12651542501 - 2¹⁰ = 12651541477 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 (12651542503) 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, 486597776 + ... + 486597801.

It is an arithmetic number, because the mean of its divisors is an integer number (3406184523).

Almost surely, 2^12651542501 is an apocalyptic number.

It is an amenable number.

12651542501 is a deficient number, since it is larger than the sum of its proper divisors (973195591).

12651542501 is an equidigital number, since it uses as much as digits as its factorization.

12651542501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973195590.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 12651542501 in words is "twelve billion, six hundred fifty-one million, five hundred forty-two thousand, five hundred one".