1561457743530 has 128 divisors (see below), whose sum is σ = 4037540069376. Its totient is φ = 385344960000.

The previous prime is 1561457743529. The next prime is 1561457743537. The reversal of 1561457743530 is 353477541651.

It is not an unprimeable number, because it can be changed into a prime (1561457743537) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149746177 + ... + 149756603.

It is an arithmetic number, because the mean of its divisors is an integer number (31543281792).

Almost surely, 2^{1561457743530} is an apocalyptic number.

1561457743530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561457743530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018770034688).

1561457743530 is an abundant number, since it is smaller than the sum of its proper divisors (2476082325846).

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

1561457743530 is a wasteful number, since it uses less digits than its factorization.

1561457743530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17492.

The product of its (nonzero) digits is 5292000, while the sum is 51.

The spelling of 1561457743530 in words is "one trillion, five hundred sixty-one billion, four hundred fifty-seven million, seven hundred forty-three thousand, five hundred thirty".