12602535661 has 4 divisors (see below), whose sum is σ = 12642291612. Its totient is φ = 12562779712.

The previous prime is 12602535653. The next prime is 12602535677. The reversal of 12602535661 is 16653520621.

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 3977698761 + 8624836900 = 63069^2 + 92870^2 .

It is a cyclic number.

It is not a de Polignac number, because 12602535661 - 2³ = 12602535653 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 12602535661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12602535601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19877500 + ... + 19878133.

It is an arithmetic number, because the mean of its divisors is an integer number (3160572903).

Almost surely, 2^12602535661 is an apocalyptic number.

It is an amenable number.

12602535661 is a deficient number, since it is larger than the sum of its proper divisors (39755951).

12602535661 is an equidigital number, since it uses as much as digits as its factorization.

12602535661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39755950.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 12602535661 in words is "twelve billion, six hundred two million, five hundred thirty-five thousand, six hundred sixty-one".