2661254520 has 256 divisors, whose sum is σ = 8564244480. Its totient is φ = 660441600.

The previous prime is 2661254501. The next prime is 2661254543. The reversal of 2661254520 is 254521662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20314855 + ... + 20314985.

It is an arithmetic number, because the mean of its divisors is an integer number (33454080).

Almost surely, 2^2661254520 is an apocalyptic number.

2661254520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2661254520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4282122240).

2661254520 is an abundant number, since it is smaller than the sum of its proper divisors (5902989960).

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

2661254520 is a wasteful number, since it uses less digits than its factorization.

2661254520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 2661254520 is about 51587.3484490141. The cubic root of 2661254520 is about 1385.7837700862.

The spelling of 2661254520 in words is "two billion, six hundred sixty-one million, two hundred fifty-four thousand, five hundred twenty".