205926691550 has 12 divisors (see below), whose sum is σ = 383023646376. Its totient is φ = 82370676600.

The previous prime is 205926691507. The next prime is 205926691673. The reversal of 205926691550 is 55196629502.

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 4118533831 = 205926691550 / (2 + 0 + 5 + 9 + 2 + 6 + 6 + 9 + 1 + 5 + 5 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2059266866 + ... + 2059266965.

It is an arithmetic number, because the mean of its divisors is an integer number (31918637198).

Almost surely, 2^205926691550 is an apocalyptic number.

205926691550 is a deficient number, since it is larger than the sum of its proper divisors (177096954826).

205926691550 is a wasteful number, since it uses less digits than its factorization.

205926691550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118533843 (or 4118533838 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 205926691550 in words is "two hundred five billion, nine hundred twenty-six million, six hundred ninety-one thousand, five hundred fifty".