2561846516 has 6 divisors (see below), whose sum is σ = 4483231410. Its totient is φ = 1280923256.

The previous prime is 2561846503. The next prime is 2561846527. The reversal of 2561846516 is 6156481652.

2561846516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1958947600 + 602898916 = 44260^2 + 24554^2 .

It is a super-3 number, since 3×2561846516³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320230811 + ... + 320230818.

It is an arithmetic number, because the mean of its divisors is an integer number (747205235).

Almost surely, 2^2561846516 is an apocalyptic number.

It is an amenable number.

2561846516 is a deficient number, since it is larger than the sum of its proper divisors (1921384894).

2561846516 is a wasteful number, since it uses less digits than its factorization.

2561846516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640461633 (or 640461631 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The square root of 2561846516 is about 50614.6867618481. The cubic root of 2561846516 is about 1368.3095843295.

The spelling of 2561846516 in words is "two billion, five hundred sixty-one million, eight hundred forty-six thousand, five hundred sixteen".