20151065660 has 48 divisors (see below), whose sum is σ = 46264200192. Its totient is φ = 7311796800.

The previous prime is 20151065611. The next prime is 20151065681. The reversal of 20151065660 is 6656015102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2945 + ... + 200775.

It is an arithmetic number, because the mean of its divisors is an integer number (963837504).

Almost surely, 2^20151065660 is an apocalyptic number.

20151065660 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 20151065660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23132100096).

20151065660 is an abundant number, since it is smaller than the sum of its proper divisors (26113134532).

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

20151065660 is a wasteful number, since it uses less digits than its factorization.

20151065660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198314 (or 198312 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 20151065660 in words is "twenty billion, one hundred fifty-one million, sixty-five thousand, six hundred sixty".