205210122551 has 16 divisors (see below), whose sum is σ = 235500652800. Its totient is φ = 175164779328.

The previous prime is 205210122539. The next prime is 205210122571. The reversal of 205210122551 is 155221012502.

It is a happy number.

It is not a de Polignac number, because 205210122551 - 2²⁶ = 205143013687 is a prime.

It is a super-2 number, since 2×205210122551² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205210122551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205210122511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1607396 + ... + 1730358.

It is an arithmetic number, because the mean of its divisors is an integer number (14718790800).

Almost surely, 2^205210122551 is an apocalyptic number.

205210122551 is a deficient number, since it is larger than the sum of its proper divisors (30290530249).

205210122551 is a wasteful number, since it uses less digits than its factorization.

205210122551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123958.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 205210122551 in words is "two hundred five billion, two hundred ten million, one hundred twenty-two thousand, five hundred fifty-one".