65881028929 has 9 divisors (see below), whose sum is σ = 66235330209. Its totient is φ = 65528616900.

The previous prime is 65881028921. The next prime is 65881028933. The reversal of 65881028929 is 92982018856.

The square root of 65881028929 is 256673.

It is a perfect power (a square), and thus also a powerful number.

65881028929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65881028929 - 2³ = 65881028921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65881028921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 57237504 + ... + 57238654.

Almost surely, 2^65881028929 is an apocalyptic number.

65881028929 is the 256673-rd square number.

65881028929 is the 128337-th centered octagonal number.

It is an amenable number.

65881028929 is a deficient number, since it is larger than the sum of its proper divisors (354301280).

65881028929 is an frugal number, since it uses more digits than its factorization.

65881028929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 65881028929 in words is "sixty-five billion, eight hundred eighty-one million, twenty-eight thousand, nine hundred twenty-nine".