1561168728542 has 32 divisors (see below), whose sum is σ = 2408048352864. Its totient is φ = 758633241600.

The previous prime is 1561168728527. The next prime is 1561168728593. The reversal of 1561168728542 is 2458278611651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102586118 + ... + 102601334.

It is an arithmetic number, because the mean of its divisors is an integer number (75251511027).

Almost surely, 2^{1561168728542} is an apocalyptic number.

1561168728542 is a deficient number, since it is larger than the sum of its proper divisors (846879624322).

1561168728542 is a wasteful number, since it uses less digits than its factorization.

1561168728542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19964.

The product of its digits is 6451200, while the sum is 56.

The spelling of 1561168728542 in words is "one trillion, five hundred sixty-one billion, one hundred sixty-eight million, seven hundred twenty-eight thousand, five hundred forty-two".