2861857445909 has 48 divisors (see below), whose sum is σ = 3610370588160. Its totient is φ = 2220531667200.

The previous prime is 2861857445903. The next prime is 2861857445911. The reversal of 2861857445909 is 9095447581682.

2861857445909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2861857445909 - 2⁴ = 2861857445893 is a prime.

It is a super-3 number, since 3×2861857445909³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861857445903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 810034307 + ... + 810037839.

It is an arithmetic number, because the mean of its divisors is an integer number (75216053920).

Almost surely, 2^{2861857445909} is an apocalyptic number.

It is an amenable number.

2861857445909 is a deficient number, since it is larger than the sum of its proper divisors (748513142251).

2861857445909 is a wasteful number, since it uses less digits than its factorization.

2861857445909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362 (or 7351 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 68.

The spelling of 2861857445909 in words is "two trillion, eight hundred sixty-one billion, eight hundred fifty-seven million, four hundred forty-five thousand, nine hundred nine".