64534215636431 has 4 divisors (see below), whose sum is σ = 64534231750032. Its totient is φ = 64534199522832.

The previous prime is 64534215636391. The next prime is 64534215636439. The reversal of 64534215636431 is 13463651243546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64534215636431 is a prime.

It is a super-2 number, since 2×64534215636431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64534215636439) 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, 3106406 + ... + 11777868.

It is an arithmetic number, because the mean of its divisors is an integer number (16133557937508).

Almost surely, 2^{64534215636431} is an apocalyptic number.

64534215636431 is a deficient number, since it is larger than the sum of its proper divisors (16113601).

64534215636431 is an equidigital number, since it uses as much as digits as its factorization.

64534215636431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16113600.

The product of its digits is 18662400, while the sum is 53.

Adding to 64534215636431 its reverse (13463651243546), we get a palindrome (77997866879977).

The spelling of 64534215636431 in words is "sixty-four trillion, five hundred thirty-four billion, two hundred fifteen million, six hundred thirty-six thousand, four hundred thirty-one".