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65801681 = 115981971
BaseRepresentation
bin1111101100000…
…0110111010001
311120211001221022
43323000313101
5113321123211
610310205225
71426206431
oct373006721
9146731838
1065801681
1134163860
121a053815
131082b90a
148a4c2c1
155b9bbdb
hex3ec0dd1

65801681 has 4 divisors (see below), whose sum is σ = 71783664. Its totient is φ = 59819700.

The previous prime is 65801669. The next prime is 65801717. The reversal of 65801681 is 18610856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-65801681 is a prime.

It is a super-2 number, since 2×658016812 = 8659722444851522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65801381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2990975 + ... + 2990996.

It is an arithmetic number, because the mean of its divisors is an integer number (17945916).

Almost surely, 265801681 is an apocalyptic number.

It is an amenable number.

65801681 is a deficient number, since it is larger than the sum of its proper divisors (5981983).

65801681 is a wasteful number, since it uses less digits than its factorization.

65801681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981982.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 65801681 is about 8111.8235311180. The cubic root of 65801681 is about 403.7188208661.

The spelling of 65801681 in words is "sixty-five million, eight hundred one thousand, six hundred eighty-one".

Divisors: 1 11 5981971 65801681