16201511721117 has 16 divisors (see below), whose sum is σ = 24291423199680. Its totient is φ = 10670875188336.

The previous prime is 16201511721113. The next prime is 16201511721119. The reversal of 16201511721117 is 71112711510261.

16201511721117 is a `hidden beast` number, since 1 + 6 + 2 + 0 + 1 + 511 + 7 + 21 + 117 = 666.

It is not a de Polignac number, because 16201511721117 - 2² = 16201511721113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16201511721113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3614792878 + ... + 3614797359.

It is an arithmetic number, because the mean of its divisors is an integer number (1518213949980).

Almost surely, 2^{16201511721117} is an apocalyptic number.

It is an amenable number.

16201511721117 is a deficient number, since it is larger than the sum of its proper divisors (8089911478563).

16201511721117 is an equidigital number, since it uses as much as digits as its factorization.

16201511721117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7229590329 (or 7229590323 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 36.

The spelling of 16201511721117 in words is "sixteen trillion, two hundred one billion, five hundred eleven million, seven hundred twenty-one thousand, one hundred seventeen".