216989592145920 has 416 divisors, whose sum is σ = 841553882144640. Its totient is φ = 52603536015360.

The previous prime is 216989592145883. The next prime is 216989592145957. The reversal of 216989592145920 is 29541295989612.

216989592145920 is a `hidden beast` number, since 2 + 1 + 6 + 9 + 8 + 9 + 5 + 9 + 21 + 4 + 592 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (216989592145883) and next prime (216989592145957).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11754469 + ... + 23919588.

Almost surely, 2^{216989592145920} is an apocalyptic number.

216989592145920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216989592145920 is an abundant number, since it is smaller than the sum of its proper divisors (624564289998720).

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

216989592145920 is a wasteful number, since it uses less digits than its factorization.

216989592145920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35674106 (or 35674078 counting only the distinct ones).

The product of its (nonzero) digits is 251942400, while the sum is 72.

The spelling of 216989592145920 in words is "two hundred sixteen trillion, nine hundred eighty-nine billion, five hundred ninety-two million, one hundred forty-five thousand, nine hundred twenty".