2011161625 has 64 divisors (see below), whose sum is σ = 2932360704. Its totient is φ = 1360896000.

The previous prime is 2011161619. The next prime is 2011161637. The reversal of 2011161625 is 5261611102.

It is a happy number.

It is not a de Polignac number, because 2011161625 - 2³ = 2011161617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011161625.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2266932 + ... + 2267818.

It is an arithmetic number, because the mean of its divisors is an integer number (45818136).

Almost surely, 2^2011161625 is an apocalyptic number.

2011161625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2011161625 is a deficient number, since it is larger than the sum of its proper divisors (921199079).

2011161625 is a wasteful number, since it uses less digits than its factorization.

2011161625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2011161625 is about 44845.9766868779. The cubic root of 2011161625 is about 1262.2604976521.

Adding to 2011161625 its reverse (5261611102), we get a palindrome (7272772727).

The spelling of 2011161625 in words is "two billion, eleven million, one hundred sixty-one thousand, six hundred twenty-five".