64721972513111 has 8 divisors (see below), whose sum is σ = 64841669867520. Its totient is φ = 64602323993592.

The previous prime is 64721972513101. The next prime is 64721972513117. The reversal of 64721972513111 is 11131527912746.

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 64721972513111 - 2¹⁸ = 64721972250967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64721972513111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721972513117) 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, 9555095 + ... + 14857448.

It is an arithmetic number, because the mean of its divisors is an integer number (8105208733440).

Almost surely, 2^{64721972513111} is an apocalyptic number.

64721972513111 is a deficient number, since it is larger than the sum of its proper divisors (119697354409).

64721972513111 is a wasteful number, since it uses less digits than its factorization.

64721972513111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24417445.

The product of its digits is 635040, while the sum is 50.

The spelling of 64721972513111 in words is "sixty-four trillion, seven hundred twenty-one billion, nine hundred seventy-two million, five hundred thirteen thousand, one hundred eleven".