206891070541 has 32 divisors (see below), whose sum is σ = 222603939936. Its totient is φ = 191600640000.

The previous prime is 206891070521. The next prime is 206891070553. The reversal of 206891070541 is 145070198602.

206891070541 = 321629² + 321630².

It can be written as a sum of positive squares in 16 ways, for example, as 27753894025 + 179137176516 = 166595^2 + 423246^2 .

It is a 7-Lehmer number, since φ(206891070541) divides (206891070541-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 206891070541 - 2¹³ = 206891062349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206891070521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312996751 + ... + 312997411.

It is an arithmetic number, because the mean of its divisors is an integer number (6956373123).

Almost surely, 2^206891070541 is an apocalyptic number.

206891070541 is the 321630-th centered square number.

It is an amenable number.

206891070541 is a deficient number, since it is larger than the sum of its proper divisors (15712869395).

206891070541 is a wasteful number, since it uses less digits than its factorization.

206891070541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 206891070541 in words is "two hundred six billion, eight hundred ninety-one million, seventy thousand, five hundred forty-one".