16209451378 has 8 divisors (see below), whose sum is σ = 24314852268. Its totient is φ = 8104500624.

The previous prime is 16209451373. The next prime is 16209451387. The reversal of 16209451378 is 87315490261.

16209451378 is a nontrivial binomial coefficient, being equal to C(180053, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 16080015249 + 129436129 = 126807^2 + 11377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (16209451373) 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, 1 + ... + 180052.

It is a 2-persistent number, because it is pandigital, and so is 2⋅16209451378 = 32418902756, but 3⋅16209451378 = 48628354134 is not.

Almost surely, 2^16209451378 is an apocalyptic number.

16209451378 is the 180052-nd triangular number.

16209451378 is the 60018-th centered nonagonal number.

16209451378 is a deficient number, since it is larger than the sum of its proper divisors (8105400890).

16209451378 is a wasteful number, since it uses less digits than its factorization.

16209451378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225068.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 16209451378 in words is "sixteen billion, two hundred nine million, four hundred fifty-one thousand, three hundred seventy-eight".