1516352412661 has 4 divisors (see below), whose sum is σ = 1596160434400. Its totient is φ = 1436544390924.

The previous prime is 1516352412647. The next prime is 1516352412683. The reversal of 1516352412661 is 1662142536151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1516352412661 - 2²⁹ = 1515815541749 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 (1516352412161) 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, 39904010841 + ... + 39904010878.

It is an arithmetic number, because the mean of its divisors is an integer number (399040108600).

Almost surely, 2^{1516352412661} is an apocalyptic number.

It is an amenable number.

1516352412661 is a deficient number, since it is larger than the sum of its proper divisors (79808021739).

1516352412661 is an equidigital number, since it uses as much as digits as its factorization.

1516352412661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79808021738.

The product of its digits is 259200, while the sum is 43.

The spelling of 1516352412661 in words is "one trillion, five hundred sixteen billion, three hundred fifty-two million, four hundred twelve thousand, six hundred sixty-one".