2800161666720 has 768 divisors, whose sum is σ = 11460465999360. Its totient is φ = 638881136640.

The previous prime is 2800161666707. The next prime is 2800161666763. The reversal of 2800161666720 is 276661610082.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 65413644 + ... + 65456436.

It is an arithmetic number, because the mean of its divisors is an integer number (14922481770).

Almost surely, 2^{2800161666720} is an apocalyptic number.

2800161666720 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 2800161666720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5730232999680).

2800161666720 is an abundant number, since it is smaller than the sum of its proper divisors (8660304332640).

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

2800161666720 is a wasteful number, since it uses less digits than its factorization.

2800161666720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42857 (or 42831 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 2800161666720 in words is "two trillion, eight hundred billion, one hundred sixty-one million, six hundred sixty-six thousand, seven hundred twenty".