16477721217522 has 48 divisors (see below), whose sum is σ = 35841358006272. Its totient is φ = 5471104292640.

The previous prime is 16477721217511. The next prime is 16477721217539. The reversal of 16477721217522 is 22571212777461.

16477721217522 is a `hidden beast` number, since 1 + 6 + 4 + 7 + 77 + 21 + 21 + 7 + 522 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16194447 + ... + 17181837.

It is an arithmetic number, because the mean of its divisors is an integer number (746694958464).

Almost surely, 2^{16477721217522} is an apocalyptic number.

16477721217522 is an abundant number, since it is smaller than the sum of its proper divisors (19363636788750).

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

16477721217522 is a wasteful number, since it uses less digits than its factorization.

16477721217522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991023 (or 991020 counting only the distinct ones).

The product of its digits is 4609920, while the sum is 54.

The spelling of 16477721217522 in words is "sixteen trillion, four hundred seventy-seven billion, seven hundred twenty-one million, two hundred seventeen thousand, five hundred twenty-two".