64421511767 has 4 divisors (see below), whose sum is σ = 65383026936. Its totient is φ = 63459996600.

The previous prime is 64421511757. The next prime is 64421511797. The reversal of 64421511767 is 76711512446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64421511767 - 2¹⁰ = 64421510743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64421511757) 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, 480757484 + ... + 480757617.

It is an arithmetic number, because the mean of its divisors is an integer number (16345756734).

Almost surely, 2^64421511767 is an apocalyptic number.

64421511767 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

64421511767 is a deficient number, since it is larger than the sum of its proper divisors (961515169).

64421511767 is an equidigital number, since it uses as much as digits as its factorization.

64421511767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961515168.

The product of its digits is 282240, while the sum is 44.

The spelling of 64421511767 in words is "sixty-four billion, four hundred twenty-one million, five hundred eleven thousand, seven hundred sixty-seven".