65221920831 has 8 divisors (see below), whose sum is σ = 87335791920. Its totient is φ = 43294665152.

The previous prime is 65221920817. The next prime is 65221920859. The reversal of 65221920831 is 13802912256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65221920831 - 2⁷ = 65221920703 is a prime.

It is a super-2 number, since 2×65221920831² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65221920831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65221927831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46653036 + ... + 46654433.

It is an arithmetic number, because the mean of its divisors is an integer number (10916973990).

Almost surely, 2^65221920831 is an apocalyptic number.

65221920831 is a deficient number, since it is larger than the sum of its proper divisors (22113871089).

65221920831 is a wasteful number, since it uses less digits than its factorization.

65221920831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93307705.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 65221920831 in words is "sixty-five billion, two hundred twenty-one million, nine hundred twenty thousand, eight hundred thirty-one".