206378710722 has 18 divisors (see below), whose sum is σ = 447158049273. Its totient is φ = 68792261112.

The previous prime is 206378710693. The next prime is 206378710723. The reversal of 206378710722 is 227017873602.

206378710722 is a `hidden beast` number, since 2 + 0 + 637 + 8 + 7 + 1 + 0 + 7 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 195708027321 + 10670683401 = 442389^2 + 103299^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=321231.

It is a super-2 number, since 2×206378710722² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206378710723) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1873848 + ... + 1980924.

Almost surely, 2^206378710722 is an apocalyptic number.

206378710722 is an abundant number, since it is smaller than the sum of its proper divisors (240779338551).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206378710722 is an frugal number, since it uses more digits than its factorization.

206378710722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214162 (or 107082 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 206378710722 in words is "two hundred six billion, three hundred seventy-eight million, seven hundred ten thousand, seven hundred twenty-two".