64811116953321 has 16 divisors (see below), whose sum is σ = 93729707160768. Its totient is φ = 39673950118400.

The previous prime is 64811116953277. The next prime is 64811116953371. The reversal of 64811116953321 is 12335961111846.

It is a cyclic number.

It is not a de Polignac number, because 64811116953321 - 2⁴² = 60413070442217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (64811116953371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15497634675 + ... + 15497638856.

It is an arithmetic number, because the mean of its divisors is an integer number (5858106697548).

Almost surely, 2^{64811116953321} is an apocalyptic number.

It is an amenable number.

64811116953321 is a deficient number, since it is larger than the sum of its proper divisors (28918590207447).

64811116953321 is a wasteful number, since it uses less digits than its factorization.

64811116953321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30995273592.

The product of its digits is 933120, while the sum is 51.

The spelling of 64811116953321 in words is "sixty-four trillion, eight hundred eleven billion, one hundred sixteen million, nine hundred fifty-three thousand, three hundred twenty-one".