516404991451 has 4 divisors (see below), whose sum is σ = 546781755672. Its totient is φ = 486028227232.

The previous prime is 516404991409. The next prime is 516404991511. The reversal of 516404991451 is 154199404615.

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

It is a cyclic number.

It is not a de Polignac number, because 516404991451 - 2²⁵ = 516371437019 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 516404991395 and 516404991404.

It is not an unprimeable number, because it can be changed into a prime (516404191451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15188382085 + ... + 15188382118.

It is an arithmetic number, because the mean of its divisors is an integer number (136695438918).

Almost surely, 2^516404991451 is an apocalyptic number.

516404991451 is a deficient number, since it is larger than the sum of its proper divisors (30376764221).

516404991451 is a wasteful number, since it uses less digits than its factorization.

516404991451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30376764220.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 516404991451 in words is "five hundred sixteen billion, four hundred four million, nine hundred ninety-one thousand, four hundred fifty-one".