204138506381520 has 40 divisors (see below), whose sum is σ = 632829369783456. Its totient is φ = 54436935035008.

The previous prime is 204138506381339. The next prime is 204138506381533. The reversal of 204138506381520 is 25183605831402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 204138506381520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425288554722 + ... + 425288555201.

Almost surely, 2^{204138506381520} is an apocalyptic number.

204138506381520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204138506381520 is an abundant number, since it is smaller than the sum of its proper divisors (428690863401936).

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

204138506381520 is a wasteful number, since it uses less digits than its factorization.

204138506381520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850577109939 (or 850577109933 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 204138506381520 in words is "two hundred four trillion, one hundred thirty-eight billion, five hundred six million, three hundred eighty-one thousand, five hundred twenty".