2661366620 has 24 divisors (see below), whose sum is σ = 6096949488. Its totient is φ = 967769600.

The previous prime is 2661366619. The next prime is 2661366649. The reversal of 2661366620 is 266631662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6048341 + ... + 6048780.

It is an arithmetic number, because the mean of its divisors is an integer number (254039562).

Almost surely, 2^2661366620 is an apocalyptic number.

2661366620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661366620 is an abundant number, since it is smaller than the sum of its proper divisors (3435582868).

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

2661366620 is a wasteful number, since it uses less digits than its factorization.

2661366620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12097141 (or 12097139 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 2661366620 is about 51588.4349442780. The cubic root of 2661366620 is about 1385.8032275987.

The spelling of 2661366620 in words is "two billion, six hundred sixty-one million, three hundred sixty-six thousand, six hundred twenty".