65864488881 has 4 divisors (see below), whose sum is σ = 87819318512. Its totient is φ = 43909659252.

The previous prime is 65864488843. The next prime is 65864488903. The reversal of 65864488881 is 18888446856.

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 not a de Polignac number, because 65864488881 - 2⁹ = 65864488369 is a prime.

It is a super-2 number, since 2×65864488881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65864488831) 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, 10977414811 + ... + 10977414816.

It is an arithmetic number, because the mean of its divisors is an integer number (21954829628).

Almost surely, 2^65864488881 is an apocalyptic number.

It is an amenable number.

65864488881 is a deficient number, since it is larger than the sum of its proper divisors (21954829631).

65864488881 is a wasteful number, since it uses less digits than its factorization.

65864488881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21954829630.

The product of its digits is 94371840, while the sum is 66.

The spelling of 65864488881 in words is "sixty-five billion, eight hundred sixty-four million, four hundred eighty-eight thousand, eight hundred eighty-one".