2561820054 has 8 divisors (see below), whose sum is σ = 5123640120. Its totient is φ = 853940016.

The previous prime is 2561820043. The next prime is 2561820071. The reversal of 2561820054 is 4500281652.

It is a sphenic number, since it is the product of 3 distinct primes.

2561820054 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 2561819997 and 2561820024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213484999 + ... + 213485010.

It is an arithmetic number, because the mean of its divisors is an integer number (640455015).

Almost surely, 2^2561820054 is an apocalyptic number.

2561820054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2561820054 is a wasteful number, since it uses less digits than its factorization.

2561820054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426970014.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 2561820054 is about 50614.4253548334. The cubic root of 2561820054 is about 1368.3048731010.

The spelling of 2561820054 in words is "two billion, five hundred sixty-one million, eight hundred twenty thousand, fifty-four".