206621896157 has 2 divisors, whose sum is σ = 206621896158. Its totient is φ = 206621896156.

The previous prime is 206621896051. The next prime is 206621896199. The reversal of 206621896157 is 751698126602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157530403801 + 49091492356 = 396901^2 + 221566^2 .

It is a cyclic number.

It is not a de Polignac number, because 206621896157 - 2²⁶ = 206554787293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206621896099 and 206621896108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206621898157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103310948078 + 103310948079.

It is an arithmetic number, because the mean of its divisors is an integer number (103310948079).

Almost surely, 2^206621896157 is an apocalyptic number.

It is an amenable number.

206621896157 is a deficient number, since it is larger than the sum of its proper divisors (1).

206621896157 is an equidigital number, since it uses as much as digits as its factorization.

206621896157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 206621896157 in words is "two hundred six billion, six hundred twenty-one million, eight hundred ninety-six thousand, one hundred fifty-seven".