16778634840 has 672 divisors, whose sum is σ = 65955904560. Its totient is φ = 3807129600.

The previous prime is 16778634811. The next prime is 16778634883. The reversal of 16778634840 is 4843687761.

16778634840 is a `hidden beast` number, since 16 + 77 + 86 + 3 + 484 + 0 = 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 polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 92699550 + ... + 92699730.

Almost surely, 2^16778634840 is an apocalyptic number.

16778634840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16778634840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32977952280).

16778634840 is an abundant number, since it is smaller than the sum of its proper divisors (49177269720).

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

16778634840 is a wasteful number, since it uses less digits than its factorization.

16778634840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 16778634840 in words is "sixteen billion, seven hundred seventy-eight million, six hundred thirty-four thousand, eight hundred forty".