206510505651 has 96 divisors (see below), whose sum is σ = 346036354560. Its totient is φ = 117877681152.

The previous prime is 206510505637. The next prime is 206510505659. The reversal of 206510505651 is 156505015602.

206510505651 is a `hidden beast` number, since 20 + 65 + 10 + 5 + 0 + 565 + 1 = 666.

It is not a de Polignac number, because 206510505651 - 2¹⁴ = 206510489267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206510505659) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6822316 + ... + 6852518.

It is an arithmetic number, because the mean of its divisors is an integer number (3604545360).

Almost surely, 2^206510505651 is an apocalyptic number.

206510505651 is a deficient number, since it is larger than the sum of its proper divisors (139525848909).

206510505651 is a wasteful number, since it uses less digits than its factorization.

206510505651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30345 (or 30342 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 206510505651 in words is "two hundred six billion, five hundred ten million, five hundred five thousand, six hundred fifty-one".