12661504871 has 8 divisors (see below), whose sum is σ = 13071563904. Its totient is φ = 12251547360.

The previous prime is 12661504861. The next prime is 12661504873. The reversal of 12661504871 is 17840516621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12661504871 - 2¹⁴ = 12661488487 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 (12661504873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290801 + ... + 331493.

It is an arithmetic number, because the mean of its divisors is an integer number (1633945488).

Almost surely, 2^12661504871 is an apocalyptic number.

12661504871 is a deficient number, since it is larger than the sum of its proper divisors (410059033).

12661504871 is a wasteful number, since it uses less digits than its factorization.

12661504871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50761.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 12661504871 in words is "twelve billion, six hundred sixty-one million, five hundred four thousand, eight hundred seventy-one".