16661326416 has 80 divisors (see below), whose sum is σ = 49226563584. Its totient is φ = 4756897152.

The previous prime is 16661326411. The next prime is 16661326421. The reversal of 16661326416 is 61462316661.

It is an interprime number because it is at equal distance from previous prime (16661326411) and next prime (16661326421).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661326411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460705 + ... + 495551.

Almost surely, 2^16661326416 is an apocalyptic number.

16661326416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16661326416 is an abundant number, since it is smaller than the sum of its proper divisors (32565237168).

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

16661326416 is a wasteful number, since it uses less digits than its factorization.

16661326416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36288 (or 36282 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The spelling of 16661326416 in words is "sixteen billion, six hundred sixty-one million, three hundred twenty-six thousand, four hundred sixteen".