16378776500 has 48 divisors (see below), whose sum is σ = 35789491920. Its totient is φ = 6548169600.

The previous prime is 16378776467. The next prime is 16378776551. The reversal of 16378776500 is 567787361.

It can be written as a sum of positive squares in 8 ways, for example, as 9959241616 + 6419534884 = 99796^2 + 80122^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1127282 + ... + 1141718.

It is an arithmetic number, because the mean of its divisors is an integer number (745614415).

Almost surely, 2^16378776500 is an apocalyptic number.

16378776500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16378776500 is an abundant number, since it is smaller than the sum of its proper divisors (19410715420).

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

16378776500 is a wasteful number, since it uses less digits than its factorization.

16378776500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16725 (or 16713 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 16378776500 in words is "sixteen billion, three hundred seventy-eight million, seven hundred seventy-six thousand, five hundred".