1601565696 has 110 divisors (see below), whose sum is σ = 4782835970. Its totient is φ = 533827584.

The previous prime is 1601565653. The next prime is 1601565697. The reversal of 1601565696 is 6965651061.

It can be written as a sum of positive squares in only one way, i.e., 1096934400 + 504631296 = 33120^2 + 22464^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601565697) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 73290 + ... + 92598.

It is an arithmetic number, because the mean of its divisors is an integer number (43480327).

Almost surely, 2^1601565696 is an apocalyptic number.

1601565696 is a gapful number since it is divisible by the number (16) 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 1601565696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2391417985).

1601565696 is an abundant number, since it is smaller than the sum of its proper divisors (3181270274).

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

1601565696 is an equidigital number, since it uses as much as digits as its factorization.

1601565696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19341 (or 19314 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 1601565696 is about 40019.5664144428. The cubic root of 1601565696 is about 1169.9884811489.

The spelling of 1601565696 in words is "one billion, six hundred one million, five hundred sixty-five thousand, six hundred ninety-six".