64108587261 has 4 divisors (see below), whose sum is σ = 85478116352. Its totient is φ = 42739058172.

The previous prime is 64108587251. The next prime is 64108587353. The reversal of 64108587261 is 16278580146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64108587261 - 2⁷ = 64108587133 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 64108587261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64108587241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10684764541 + ... + 10684764546.

It is an arithmetic number, because the mean of its divisors is an integer number (21369529088).

Almost surely, 2^64108587261 is an apocalyptic number.

It is an amenable number.

64108587261 is a deficient number, since it is larger than the sum of its proper divisors (21369529091).

64108587261 is a wasteful number, since it uses less digits than its factorization.

64108587261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21369529090.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 64108587261 in words is "sixty-four billion, one hundred eight million, five hundred eighty-seven thousand, two hundred sixty-one".