1626721161 has 24 divisors (see below), whose sum is σ = 2450771136. Its totient is φ = 957528000.

The previous prime is 1626721147. The next prime is 1626721171. The reversal of 1626721161 is 1611276261.

1626721161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1626721161 - 2⁶ = 1626721097 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1626721111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58090 + ... + 81411.

It is an arithmetic number, because the mean of its divisors is an integer number (102115464).

Almost surely, 2^1626721161 is an apocalyptic number.

It is an amenable number.

1626721161 is a deficient number, since it is larger than the sum of its proper divisors (824049975).

1626721161 is a wasteful number, since it uses less digits than its factorization.

1626721161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139553 (or 139540 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 1626721161 is about 40332.6314663450. The cubic root of 1626721161 is about 1176.0822769440.

Subtracting from 1626721161 its reverse (1611276261), we obtain a square (15444900 = 3930²).

The spelling of 1626721161 in words is "one billion, six hundred twenty-six million, seven hundred twenty-one thousand, one hundred sixty-one".