1561542005838 has 32 divisors (see below), whose sum is σ = 3170395199232. Its totient is φ = 512644193600.

The previous prime is 1561542005831. The next prime is 1561542005873. The reversal of 1561542005838 is 8385002451651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561542005831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1517208 + ... + 2329163.

It is an arithmetic number, because the mean of its divisors is an integer number (99074849976).

Almost surely, 2^{1561542005838} is an apocalyptic number.

1561542005838 is an abundant number, since it is smaller than the sum of its proper divisors (1608853193394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561542005838 is a wasteful number, since it uses less digits than its factorization.

1561542005838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847400.

The product of its (nonzero) digits is 1152000, while the sum is 48.

The spelling of 1561542005838 in words is "one trillion, five hundred sixty-one billion, five hundred forty-two million, five thousand, eight hundred thirty-eight".