2661544651620 has 96 divisors (see below), whose sum is σ = 7709715820800. Its totient is φ = 685234461184.

The previous prime is 2661544651517. The next prime is 2661544651631. The reversal of 2661544651620 is 261564451662.

It is a happy number.

2661544651620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2661544651620.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49592761 + ... + 49646399.

It is an arithmetic number, because the mean of its divisors is an integer number (80309539800).

Almost surely, 2^{2661544651620} is an apocalyptic number.

2661544651620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661544651620 is an abundant number, since it is smaller than the sum of its proper divisors (5048171169180).

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

2661544651620 is a wasteful number, since it uses less digits than its factorization.

2661544651620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82197 (or 82195 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 2661544651620 in words is "two trillion, six hundred sixty-one billion, five hundred forty-four million, six hundred fifty-one thousand, six hundred twenty".