2156772666720 has 1152 divisors, whose sum is σ = 8649817860096. Its totient is φ = 441564659712.

The previous prime is 2156772666667. The next prime is 2156772666733. The reversal of 2156772666720 is 276662776512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2706113362 + ... + 2706114158.

It is an arithmetic number, because the mean of its divisors is an integer number (7508522448).

Almost surely, 2^{2156772666720} is an apocalyptic number.

2156772666720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156772666720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4324908930048).

2156772666720 is an abundant number, since it is smaller than the sum of its proper divisors (6493045193376).

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

2156772666720 is a wasteful number, since it uses less digits than its factorization.

2156772666720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 57.

The spelling of 2156772666720 in words is "two trillion, one hundred fifty-six billion, seven hundred seventy-two million, six hundred sixty-six thousand, seven hundred twenty".