2180661825 has 48 divisors (see below), whose sum is σ = 4018403520. Its totient is φ = 1036984320.

The previous prime is 2180661823. The next prime is 2180661851. The reversal of 2180661825 is 5281660812.

It is not a de Polignac number, because 2180661825 - 2¹ = 2180661823 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2180661823) 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, 20784 + ... + 69233.

It is an arithmetic number, because the mean of its divisors is an integer number (83716740).

Almost surely, 2^2180661825 is an apocalyptic number.

2180661825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2180661825 is a deficient number, since it is larger than the sum of its proper divisors (1837741695).

2180661825 is a wasteful number, since it uses less digits than its factorization.

2180661825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90066 (or 90061 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 2180661825 is about 46697.5569489454. The cubic root of 2180661825 is about 1296.7694589295.

The spelling of 2180661825 in words is "two billion, one hundred eighty million, six hundred sixty-one thousand, eight hundred twenty-five".