16235020781520 has 80 divisors (see below), whose sum is σ = 50519927981952. Its totient is φ = 4312877493760.

The previous prime is 16235020781479. The next prime is 16235020781557. The reversal of 16235020781520 is 2518702053261.

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

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, 128541291 + ... + 128667530.

Almost surely, 2^{16235020781520} is an apocalyptic number.

16235020781520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16235020781520 is an abundant number, since it is smaller than the sum of its proper divisors (34284907200432).

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

16235020781520 is a wasteful number, since it uses less digits than its factorization.

16235020781520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257209100 (or 257209094 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 16235020781520 in words is "sixteen trillion, two hundred thirty-five billion, twenty million, seven hundred eighty-one thousand, five hundred twenty".