65906881 has 4 divisors (see below), whose sum is σ = 65934000. Its totient is φ = 65879764.

The previous prime is 65906861. The next prime is 65906923. The reversal of 65906881 is 18860956.

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 not a de Polignac number, because 65906881 - 2⁵ = 65906849 is a prime.

It is a super-2 number, since 2×65906881² = 8687433926296322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65906851) 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, 9511 + ... + 14908.

It is an arithmetic number, because the mean of its divisors is an integer number (16483500).

Almost surely, 2^65906881 is an apocalyptic number.

It is an amenable number.

65906881 is a deficient number, since it is larger than the sum of its proper divisors (27119).

65906881 is a wasteful number, since it uses less digits than its factorization.

65906881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27118.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 65906881 is about 8118.3053034485. The cubic root of 65906881 is about 403.9338539061.

The spelling of 65906881 in words is "sixty-five million, nine hundred six thousand, eight hundred eighty-one".