16717987440 has 320 divisors, whose sum is σ = 71793976320. Its totient is φ = 3473832960.

The previous prime is 16717987439. The next prime is 16717987441. The reversal of 16717987440 is 4478971761.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16717987439) and next prime (16717987441).

It is a super-2 number, since 2×16717987440² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16717987441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116062 + ... + 216578.

It is an arithmetic number, because the mean of its divisors is an integer number (224356176).

Almost surely, 2^16717987440 is an apocalyptic number.

16717987440 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 16717987440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35896988160).

16717987440 is an abundant number, since it is smaller than the sum of its proper divisors (55075988880).

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

16717987440 is a wasteful number, since it uses less digits than its factorization.

16717987440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100557 (or 100545 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 16717987440 in words is "sixteen billion, seven hundred seventeen million, nine hundred eighty-seven thousand, four hundred forty".