2861641720869 has 16 divisors (see below), whose sum is σ = 4016402808000. Its totient is φ = 1807324068096.

The previous prime is 2861641720829. The next prime is 2861641720897. The reversal of 2861641720869 is 9680271461682.

It is a happy number.

It is not a de Polignac number, because 2861641720869 - 2³⁷ = 2724202767397 is a prime.

It is a super-2 number, since 2×2861641720869² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861641720829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3583707 + ... + 4308855.

It is an arithmetic number, because the mean of its divisors is an integer number (251025175500).

Almost surely, 2^{2861641720869} is an apocalyptic number.

It is an amenable number.

2861641720869 is a deficient number, since it is larger than the sum of its proper divisors (1154761087131).

2861641720869 is a wasteful number, since it uses less digits than its factorization.

2861641720869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794404.

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 2861641720869 in words is "two trillion, eight hundred sixty-one billion, six hundred forty-one million, seven hundred twenty thousand, eight hundred sixty-nine".