12601752661 has 6 divisors (see below), whose sum is σ = 12916610786. Its totient is φ = 12294391200.

The previous prime is 12601752643. The next prime is 12601752689. The reversal of 12601752661 is 16625710621.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 262764100 + 12338988561 = 16210^2 + 111081^2 .

It is not a de Polignac number, because 12601752661 - 2¹³ = 12601744469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12601752661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12601252661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3746610 + ... + 3749971.

Almost surely, 2^12601752661 is an apocalyptic number.

It is an amenable number.

12601752661 is a deficient number, since it is larger than the sum of its proper divisors (314858125).

12601752661 is an frugal number, since it uses more digits than its factorization.

12601752661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496663 (or 7496622 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 12601752661 in words is "twelve billion, six hundred one million, seven hundred fifty-two thousand, six hundred sixty-one".