206156052514123 has 4 divisors (see below), whose sum is σ = 206176147665480. Its totient is φ = 206135957362768.

The previous prime is 206156052514063. The next prime is 206156052514151. The reversal of 206156052514123 is 321415250651602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206156052514123 is a prime.

It is a super-2 number, since 2×206156052514123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206156052514123.

It is not an unprimeable number, because it can be changed into a prime (206156052518123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10047560290 + ... + 10047580807.

It is an arithmetic number, because the mean of its divisors is an integer number (51544036916370).

Almost surely, 2^{206156052514123} is an apocalyptic number.

206156052514123 is a deficient number, since it is larger than the sum of its proper divisors (20095151357).

206156052514123 is a wasteful number, since it uses less digits than its factorization.

206156052514123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095151356.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 206156052514123 in words is "two hundred six trillion, one hundred fifty-six billion, fifty-two million, five hundred fourteen thousand, one hundred twenty-three".