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18900000681 = 3127254319507
BaseRepresentation
bin10001100110100001…
…110001111110101001
31210210011200111212020
4101212201301332221
5302201400010211
612403232335053
71236234232542
oct214641617651
953704614766
1018900000681
118019615281
1237b56a4489
131a22827373
14cb41874c9
157593d5306
hex466871fa9

18900000681 has 16 divisors (see below), whose sum is σ = 25409716224. Its totient is φ = 12495231504.

The previous prime is 18900000677. The next prime is 18900000683. The reversal of 18900000681 is 18600000981.

It is not a de Polignac number, because 18900000681 - 22 = 18900000677 is a prime.

It is a super-2 number, since 2×189000006812 (a number of 21 digits) contains 22 as substring.

18900000681 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18900000683) 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, 959130 + ... + 978636.

It is an arithmetic number, because the mean of its divisors is an integer number (1588107264).

Almost surely, 218900000681 is an apocalyptic number.

It is an amenable number.

18900000681 is a deficient number, since it is larger than the sum of its proper divisors (6509715543).

18900000681 is a wasteful number, since it uses less digits than its factorization.

18900000681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22180.

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 18900000681 in words is "eighteen billion, nine hundred million, six hundred eighty-one", and thus it is an aban number.

Divisors: 1 3 127 381 2543 7629 19507 58521 322961 968883 2477389 7432167 49606301 148818903 6300000227 18900000681