204540015646 has 4 divisors (see below), whose sum is σ = 306810023472. Its totient is φ = 102270007822.

The previous prime is 204540015599. The next prime is 204540015653. The reversal of 204540015646 is 646510045402.

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

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, 51135003910 + ... + 51135003913.

It is an arithmetic number, because the mean of its divisors is an integer number (76702505868).

Almost surely, 2^204540015646 is an apocalyptic number.

204540015646 is a deficient number, since it is larger than the sum of its proper divisors (102270007826).

204540015646 is a wasteful number, since it uses less digits than its factorization.

204540015646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102270007825.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 204540015646 in words is "two hundred four billion, five hundred forty million, fifteen thousand, six hundred forty-six".