2661756870 has 64 divisors (see below), whose sum is σ = 6453457920. Its totient is φ = 702585600.

The previous prime is 2661756863. The next prime is 2661756871. The reversal of 2661756870 is 786571662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661756871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1796530 + ... + 1798010.

It is an arithmetic number, because the mean of its divisors is an integer number (100835280).

Almost surely, 2^2661756870 is an apocalyptic number.

2661756870 is an abundant number, since it is smaller than the sum of its proper divisors (3791701050).

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

2661756870 is a wasteful number, since it uses less digits than its factorization.

2661756870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 2661756870 is about 51592.2171456122. The cubic root of 2661756870 is about 1385.8709601280.

The spelling of 2661756870 in words is "two billion, six hundred sixty-one million, seven hundred fifty-six thousand, eight hundred seventy".