2166578913 has 8 divisors (see below), whose sum is σ = 2889050976. Its totient is φ = 1444246400.

The previous prime is 2166578903. The next prime is 2166578917. The reversal of 2166578913 is 3198756612.

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 2166578913 - 2⁶ = 2166578849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166578917) 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, 9358 + ... + 66488.

It is an arithmetic number, because the mean of its divisors is an integer number (361131372).

Almost surely, 2^2166578913 is an apocalyptic number.

It is an amenable number.

2166578913 is a deficient number, since it is larger than the sum of its proper divisors (722472063).

2166578913 is a wasteful number, since it uses less digits than its factorization.

2166578913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69775.

The product of its digits is 544320, while the sum is 48.

The square root of 2166578913 is about 46546.5241774292. The cubic root of 2166578913 is about 1293.9718762874.

The spelling of 2166578913 in words is "two billion, one hundred sixty-six million, five hundred seventy-eight thousand, nine hundred thirteen".