64610834781 has 8 divisors (see below), whose sum is σ = 86150140480. Its totient is φ = 43072709472.

The previous prime is 64610834753. The next prime is 64610834791. The reversal of 64610834781 is 18743801646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64610834781 - 2²⁷ = 64476617053 is a prime.

It is a super-2 number, since 2×64610834781² (a number of 22 digits) contains 22 as substring.

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 64610834781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64610834791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158320 + ... + 392793.

It is an arithmetic number, because the mean of its divisors is an integer number (10768767560).

Almost surely, 2^64610834781 is an apocalyptic number.

It is an amenable number.

64610834781 is a deficient number, since it is larger than the sum of its proper divisors (21539305699).

64610834781 is a wasteful number, since it uses less digits than its factorization.

64610834781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590195.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 64610834781 in words is "sixty-four billion, six hundred ten million, eight hundred thirty-four thousand, seven hundred eighty-one".