2651521660 has 24 divisors (see below), whose sum is σ = 5704006896. Its totient is φ = 1034739840.

The previous prime is 2651521657. The next prime is 2651521681. The reversal of 2651521660 is 661251562.

It is a super-2 number, since 2×2651521660² = 14061134226898311200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615962 + ... + 1617601.

It is an arithmetic number, because the mean of its divisors is an integer number (237666954).

Almost surely, 2^2651521660 is an apocalyptic number.

2651521660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2651521660 is an abundant number, since it is smaller than the sum of its proper divisors (3052485236).

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

2651521660 is a wasteful number, since it uses less digits than its factorization.

2651521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233613 (or 3233611 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 2651521660 is about 51492.9282523338. The cubic root of 2651521660 is about 1384.0923227697.

The spelling of 2651521660 in words is "two billion, six hundred fifty-one million, five hundred twenty-one thousand, six hundred sixty".