16416994100521 has 9 divisors (see below), whose sum is σ = 19097352661149. Its totient is φ = 14071684918284.

The previous prime is 16416994100497. The next prime is 16416994100581. The reversal of 16416994100521 is 12500149961461.

The square root of 16416994100521 is 4051789.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 16416994100521 - 2¹⁵ = 16416994067753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (16416994100581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 28073110 + ... + 28651936.

It is an arithmetic number, because the mean of its divisors is an integer number (2121928073461).

Almost surely, 2^{16416994100521} is an apocalyptic number.

16416994100521 is the 4051789-th square number.

16416994100521 is the 2025895-th centered octagonal number.

It is an amenable number.

16416994100521 is a deficient number, since it is larger than the sum of its proper divisors (2680358560628).

16416994100521 is an frugal number, since it uses more digits than its factorization.

16416994100521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157668 (or 578834 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

Multiplying 16416994100521 by its sum of digits (49), we get a square (804432710925529 = 28362523²).

16416994100521 divided by its sum of digits (49) gives a square (335040695929 = 578827²).

The spelling of 16416994100521 in words is "sixteen trillion, four hundred sixteen billion, nine hundred ninety-four million, one hundred thousand, five hundred twenty-one".