2581980156 has 144 divisors (see below), whose sum is σ = 7654972416. Its totient is φ = 718492032.

The previous prime is 2581980151. The next prime is 2581980187. The reversal of 2581980156 is 6510891852.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2581980151) 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, 3280395 + ... + 3281181.

Almost surely, 2^2581980156 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 2581980156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3827486208).

2581980156 is an abundant number, since it is smaller than the sum of its proper divisors (5072992260).

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

2581980156 is a wasteful number, since it uses less digits than its factorization.

2581980156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1123 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The square root of 2581980156 is about 50813.1887997595. The cubic root of 2581980156 is about 1371.8847655146.

The spelling of 2581980156 in words is "two billion, five hundred eighty-one million, nine hundred eighty thousand, one hundred fifty-six".