16520976554 has 4 divisors (see below), whose sum is σ = 24781464834. Its totient is φ = 8260488276.

The previous prime is 16520976553. The next prime is 16520976559. The reversal of 16520976554 is 45567902561.

16520976554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12983463025 + 3537513529 = 113945^2 + 59477^2 .

It is not an unprimeable number, because it can be changed into a prime (16520976553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130244137 + ... + 4130244140.

Almost surely, 2^16520976554 is an apocalyptic number.

16520976554 is a deficient number, since it is larger than the sum of its proper divisors (8260488280).

16520976554 is an equidigital number, since it uses as much as digits as its factorization.

16520976554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8260488279.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 16520976554 in words is "sixteen billion, five hundred twenty million, nine hundred seventy-six thousand, five hundred fifty-four".