6261521656 has 96 divisors (see below), whose sum is σ = 13487217120. Its totient is φ = 2718144000.

The previous prime is 6261521641. The next prime is 6261521683. The reversal of 6261521656 is 6561251626.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1895206 + ... + 1898506.

It is an arithmetic number, because the mean of its divisors is an integer number (140491845).

Almost surely, 2^6261521656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6261521656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6743608560).

6261521656 is an abundant number, since it is smaller than the sum of its proper divisors (7225695464).

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

6261521656 is a wasteful number, since it uses less digits than its factorization.

6261521656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3400 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 6261521656 is about 79129.7773028586. Note that the first 3 decimals coincide. The cubic root of 6261521656 is about 1843.1469516573.

The spelling of 6261521656 in words is "six billion, two hundred sixty-one million, five hundred twenty-one thousand, six hundred fifty-six".