1561038488140 has 144 divisors (see below), whose sum is σ = 3608241487200. Its totient is φ = 566817292288.

The previous prime is 1561038488117. The next prime is 1561038488203. The reversal of 1561038488140 is 418848301651.

It is a super-2 number, since 2×1561038488140² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18030876 + ... + 18117244.

It is an arithmetic number, because the mean of its divisors is an integer number (25057232550).

Almost surely, 2^{1561038488140} is an apocalyptic number.

1561038488140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561038488140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1804120743600).

1561038488140 is an abundant number, since it is smaller than the sum of its proper divisors (2047202999060).

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

1561038488140 is a wasteful number, since it uses less digits than its factorization.

1561038488140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86524 (or 86505 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 1561038488140 in words is "one trillion, five hundred sixty-one billion, thirty-eight million, four hundred eighty-eight thousand, one hundred forty".