499511321478 has 96 divisors (see below), whose sum is σ = 1209252425472. Its totient is φ = 153624794400.

The previous prime is 499511321377. The next prime is 499511321501. The reversal of 499511321478 is 874123115994.

499511321478 is a `hidden beast` number, since 4 + 99 + 51 + 1 + 32 + 1 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 14583793 + ... + 14618003.

It is an arithmetic number, because the mean of its divisors is an integer number (12596379432).

Almost surely, 2^499511321478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 499511321478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604626212736).

499511321478 is an abundant number, since it is smaller than the sum of its proper divisors (709741103994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

499511321478 is a wasteful number, since it uses less digits than its factorization.

499511321478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36552 (or 36540 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 499511321478 in words is "four hundred ninety-nine billion, five hundred eleven million, three hundred twenty-one thousand, four hundred seventy-eight".