2661061660 has 48 divisors (see below), whose sum is σ = 5713182720. Its totient is φ = 1040816960.

The previous prime is 2661061639. The next prime is 2661061673. The reversal of 2661061660 is 661601662.

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, 219477 + ... + 231283.

It is an arithmetic number, because the mean of its divisors is an integer number (119024640).

Almost surely, 2^2661061660 is an apocalyptic number.

2661061660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661061660 is an abundant number, since it is smaller than the sum of its proper divisors (3052121060).

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

2661061660 is a wasteful number, since it uses less digits than its factorization.

2661061660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066 (or 12064 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2661061660 is about 51585.4791583833. The cubic root of 2661061660 is about 1385.7502935544.

The spelling of 2661061660 in words is "two billion, six hundred sixty-one million, sixty-one thousand, six hundred sixty".