205452521040 has 80 divisors (see below), whose sum is σ = 685895349888. Its totient is φ = 50572927488.

The previous prime is 205452521023. The next prime is 205452521051. The reversal of 205452521040 is 40125254502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 205452520989 and 205452521007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32921964 + ... + 32928203.

Almost surely, 2^205452521040 is an apocalyptic number.

205452521040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205452521040 is an abundant number, since it is smaller than the sum of its proper divisors (480442828848).

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

205452521040 is a wasteful number, since it uses less digits than its factorization.

205452521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65850196 (or 65850190 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 205452521040 its reverse (40125254502), we get a palindrome (245577775542).

The spelling of 205452521040 in words is "two hundred five billion, four hundred fifty-two million, five hundred twenty-one thousand, forty".