205104021550 has 48 divisors (see below), whose sum is σ = 383434400592. Its totient is φ = 81625107200.

The previous prime is 205104021533. The next prime is 205104021571. The reversal of 205104021550 is 55120401502.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9501069 + ... + 9522631.

It is an arithmetic number, because the mean of its divisors is an integer number (7988216679).

Almost surely, 2^205104021550 is an apocalyptic number.

205104021550 is a deficient number, since it is larger than the sum of its proper divisors (178330379042).

205104021550 is a wasteful number, since it uses less digits than its factorization.

205104021550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22533 (or 22528 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 205104021550 in words is "two hundred five billion, one hundred four million, twenty-one thousand, five hundred fifty".