1600725561 has 16 divisors (see below), whose sum is σ = 2205135744. Its totient is φ = 1032079104.

The previous prime is 1600725551. The next prime is 1600725589. The reversal of 1600725561 is 1655270061.

It is not a de Polignac number, because 1600725561 - 2²³ = 1592336953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1600725551) 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, 24640 + ... + 61713.

It is an arithmetic number, because the mean of its divisors is an integer number (137820984).

Almost surely, 2^1600725561 is an apocalyptic number.

It is an amenable number.

1600725561 is a deficient number, since it is larger than the sum of its proper divisors (604410183).

1600725561 is a wasteful number, since it uses less digits than its factorization.

1600725561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86560.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1600725561 is about 40009.0684845324. The cubic root of 1600725561 is about 1169.7838646705.

The spelling of 1600725561 in words is "one billion, six hundred million, seven hundred twenty-five thousand, five hundred sixty-one".