64531440121 has 8 divisors (see below), whose sum is σ = 65850660288. Its totient is φ = 63220650000.

The previous prime is 64531440119. The next prime is 64531440137. The reversal of 64531440121 is 12104413546.

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 64531440121 - 2¹ = 64531440119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64531440151) 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, 2092045 + ... + 2122666.

It is an arithmetic number, because the mean of its divisors is an integer number (8231332536).

Almost surely, 2^64531440121 is an apocalyptic number.

64531440121 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64531440121 is a deficient number, since it is larger than the sum of its proper divisors (1319220167).

64531440121 is a wasteful number, since it uses less digits than its factorization.

64531440121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215023.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 64531440121 its reverse (12104413546), we get a palindrome (76635853667).

The spelling of 64531440121 in words is "sixty-four billion, five hundred thirty-one million, four hundred forty thousand, one hundred twenty-one".