2661220524 has 24 divisors (see below), whose sum is σ = 6326676720. Its totient is φ = 870336064.

The previous prime is 2661220519. The next prime is 2661220553. The reversal of 2661220524 is 4250221662.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2661220491 and 2661220500.

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, 2091519 + ... + 2092790.

It is an arithmetic number, because the mean of its divisors is an integer number (263611530).

Almost surely, 2^2661220524 is an apocalyptic number.

It is an amenable number.

2661220524 is an abundant number, since it is smaller than the sum of its proper divisors (3665456196).

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

2661220524 is a wasteful number, since it uses less digits than its factorization.

2661220524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184369 (or 4184367 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2661220524 is about 51587.0189485688. The cubic root of 2661220524 is about 1385.7778691968. Note that the first 3 decimals are identical.

The spelling of 2661220524 in words is "two billion, six hundred sixty-one million, two hundred twenty thousand, five hundred twenty-four".