2664861857 has 16 divisors (see below), whose sum is σ = 3207693312. Its totient is φ = 2164422480.

The previous prime is 2664861839. The next prime is 2664861863. The reversal of 2664861857 is 7581684662.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2664861857 - 2¹⁰ = 2664860833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2664861799 and 2664861808.

It is not an unprimeable number, because it can be changed into a prime (2664861887) 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, 60119 + ... + 94572.

It is an arithmetic number, because the mean of its divisors is an integer number (200480832).

Almost surely, 2^2664861857 is an apocalyptic number.

It is an amenable number.

2664861857 is a deficient number, since it is larger than the sum of its proper divisors (542831455).

2664861857 is a wasteful number, since it uses less digits than its factorization.

2664861857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154828.

The product of its digits is 3870720, while the sum is 53.

The square root of 2664861857 is about 51622.2999971911. The cubic root of 2664861857 is about 1386.4096318136.

The spelling of 2664861857 in words is "two billion, six hundred sixty-four million, eight hundred sixty-one thousand, eight hundred fifty-seven".