204155132105542 has 4 divisors (see below), whose sum is σ = 306232698158316. Its totient is φ = 102077566052770.

The previous prime is 204155132105531. The next prime is 204155132105567. The reversal of 204155132105542 is 245501231551402.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×204155132105542² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204155132105495 and 204155132105504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51038783026384 + ... + 51038783026387.

It is an arithmetic number, because the mean of its divisors is an integer number (76558174539579).

Almost surely, 2^{204155132105542} is an apocalyptic number.

204155132105542 is a deficient number, since it is larger than the sum of its proper divisors (102077566052774).

204155132105542 is a wasteful number, since it uses less digits than its factorization.

204155132105542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102077566052773.

The product of its (nonzero) digits is 240000, while the sum is 40.

Adding to 204155132105542 its reverse (245501231551402), we get a palindrome (449656363656944).

The spelling of 204155132105542 in words is "two hundred four trillion, one hundred fifty-five billion, one hundred thirty-two million, one hundred five thousand, five hundred forty-two".