205155252345450 has 48 divisors (see below), whose sum is σ = 555038209986336. Its totient is φ = 49734606628800.

The previous prime is 205155252345443. The next prime is 205155252345499. The reversal of 205155252345450 is 54543252551502.

It is a super-2 number, since 2×205155252345450² (a number of 29 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 205155252345450.

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, 62168256637 + ... + 62168259936.

It is an arithmetic number, because the mean of its divisors is an integer number (11563296041382).

Almost surely, 2^{205155252345450} is an apocalyptic number.

205155252345450 is an abundant number, since it is smaller than the sum of its proper divisors (349882957640886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205155252345450 is a wasteful number, since it uses less digits than its factorization.

205155252345450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124336516599 (or 124336516594 counting only the distinct ones).

The product of its (nonzero) digits is 6000000, while the sum is 48.

The spelling of 205155252345450 in words is "two hundred five trillion, one hundred fifty-five billion, two hundred fifty-two million, three hundred forty-five thousand, four hundred fifty".