16351378515 has 24 divisors (see below), whose sum is σ = 30009590208. Its totient is φ = 8207750400.

The previous prime is 16351378489. The next prime is 16351378529. The reversal of 16351378515 is 51587315361.

16351378515 is a `hidden beast` number, since 1 + 63 + 5 + 1 + 3 + 78 + 515 = 666.

It is not a de Polignac number, because 16351378515 - 2⁹ = 16351378003 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10686411 + ... + 10687940.

It is an arithmetic number, because the mean of its divisors is an integer number (1250399592).

Almost surely, 2^16351378515 is an apocalyptic number.

16351378515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16351378515 is a deficient number, since it is larger than the sum of its proper divisors (13658211693).

16351378515 is a wasteful number, since it uses less digits than its factorization.

16351378515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21374379 (or 21374376 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 16351378515 in words is "sixteen billion, three hundred fifty-one million, three hundred seventy-eight thousand, five hundred fifteen".