1872712172781 has 16 divisors (see below), whose sum is σ = 2801857600320. Its totient is φ = 1236113643600.

The previous prime is 1872712172731. The next prime is 1872712172789.

1872712172781 is a `hidden beast` number, since 1 + 87 + 271 + 21 + 7 + 278 + 1 = 666.

1872712172781 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1872712172781 - 2²⁶ = 1872645063917 is a prime.

It is a super-2 number, since 2×1872712172781² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872712172789) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 343362175 + ... + 343367628.

It is an arithmetic number, because the mean of its divisors is an integer number (175116100020).

Almost surely, 2^{1872712172781} is an apocalyptic number.

It is an amenable number.

1872712172781 is a deficient number, since it is larger than the sum of its proper divisors (929145427539).

1872712172781 is a wasteful number, since it uses less digits than its factorization.

1872712172781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686729913 (or 686729907 counting only the distinct ones).

The product of its digits is 1229312, while the sum is 54.

The spelling of 1872712172781 in words is "one trillion, eight hundred seventy-two billion, seven hundred twelve million, one hundred seventy-two thousand, seven hundred eighty-one".