2072107800781 has 8 divisors (see below), whose sum is σ = 2075616461304. Its totient is φ = 2068599559680.

The previous prime is 2072107800779. The next prime is 2072107800787. The reversal of 2072107800781 is 1870087012702.

It can be written as a sum of positive squares in 4 ways, for example, as 2523454756 + 2069584346025 = 50234^2 + 1438605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2072107800781 - 2¹ = 2072107800779 is a prime.

It is a super-2 number, since 2×2072107800781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072107800787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10728021 + ... + 10919461.

It is an arithmetic number, because the mean of its divisors is an integer number (259452057663).

Almost surely, 2^{2072107800781} is an apocalyptic number.

It is an amenable number.

2072107800781 is a deficient number, since it is larger than the sum of its proper divisors (3508660523).

2072107800781 is a wasteful number, since it uses less digits than its factorization.

2072107800781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209711.

The product of its (nonzero) digits is 87808, while the sum is 43.

The spelling of 2072107800781 in words is "two trillion, seventy-two billion, one hundred seven million, eight hundred thousand, seven hundred eighty-one".