16721512155 has 16 divisors (see below), whose sum is σ = 29727132960. Its totient is φ = 8918139744.

The previous prime is 16721512139. The next prime is 16721512183. The reversal of 16721512155 is 55121512761.

It is not a de Polignac number, because 16721512155 - 2⁴ = 16721512139 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61931392 + ... + 61931661.

It is an arithmetic number, because the mean of its divisors is an integer number (1857945810).

Almost surely, 2^16721512155 is an apocalyptic number.

16721512155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16721512155 is a deficient number, since it is larger than the sum of its proper divisors (13005620805).

16721512155 is a wasteful number, since it uses less digits than its factorization.

16721512155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123863067 (or 123863061 counting only the distinct ones).

The product of its digits is 21000, while the sum is 36.

The spelling of 16721512155 in words is "sixteen billion, seven hundred twenty-one million, five hundred twelve thousand, one hundred fifty-five".