2025161721 has 48 divisors (see below), whose sum is σ = 3369600000. Its totient is φ = 1159146720.

The previous prime is 2025161713. The next prime is 2025161767. The reversal of 2025161721 is 1271615202.

2025161721 is a `hidden beast` number, since 2 + 0 + 25 + 1 + 617 + 21 = 666.

It is not a de Polignac number, because 2025161721 - 2³ = 2025161713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2025161221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 673780 + ... + 676778.

It is an arithmetic number, because the mean of its divisors is an integer number (70200000).

Almost surely, 2^2025161721 is an apocalyptic number.

It is an amenable number.

2025161721 is a deficient number, since it is larger than the sum of its proper divisors (1344438279).

2025161721 is a wasteful number, since it uses less digits than its factorization.

2025161721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3391 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 2025161721 is about 45001.7968641253. The cubic root of 2025161721 is about 1265.1826762596.

Adding to 2025161721 its reverse (1271615202), we get a palindrome (3296776923).

The spelling of 2025161721 in words is "two billion, twenty-five million, one hundred sixty-one thousand, seven hundred twenty-one".