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216550897920 = 28325721961331
BaseRepresentation
bin1100100110101101110…
…0000111100100000000
3202200221210201102011200
43021223130013210000
512021444012213140
6243252045141200
721434222155500
oct3115334074400
9680853642150
10216550897920
1183925377835
1235b7655a800
131756126b4b6
14a6a4297a00
1559764d9030
hex326b707900

216550897920 has 1296 divisors, whose sum is σ = 935298262080. Its totient is φ = 45984153600.

The previous prime is 216550897861. The next prime is 216550897943. The reversal of 216550897920 is 29798055612.

216550897920 is a `hidden beast` number, since 2 + 1 + 6 + 550 + 89 + 7 + 9 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 654232155 + ... + 654232485.

Almost surely, 2216550897920 is an apocalyptic number.

216550897920 is a gapful number since it is divisible by the number (20) 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 216550897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467649131040).

216550897920 is an abundant number, since it is smaller than the sum of its proper divisors (718747364160).

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

216550897920 is a wasteful number, since it uses less digits than its factorization.

216550897920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 216550897920 in words is "two hundred sixteen billion, five hundred fifty million, eight hundred ninety-seven thousand, nine hundred twenty".