2661247772 has 24 divisors (see below), whose sum is σ = 4729764480. Its totient is φ = 1309912560.

The previous prime is 2661247751. The next prime is 2661247781. The reversal of 2661247772 is 2777421662.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 678497 + ... + 682407.

It is an arithmetic number, because the mean of its divisors is an integer number (197073520).

Almost surely, 2^2661247772 is an apocalyptic number.

It is an amenable number.

2661247772 is a deficient number, since it is larger than the sum of its proper divisors (2068516708).

2661247772 is a wasteful number, since it uses less digits than its factorization.

2661247772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521 (or 6519 counting only the distinct ones).

The product of its digits is 395136, while the sum is 44.

The square root of 2661247772 is about 51587.2830453398. The cubic root of 2661247772 is about 1385.7825987994.

The spelling of 2661247772 in words is "two billion, six hundred sixty-one million, two hundred forty-seven thousand, seven hundred seventy-two".