64648381251 has 8 divisors (see below), whose sum is σ = 87411896064. Its totient is φ = 42491893640.

The previous prime is 64648381249. The next prime is 64648381289. The reversal of 64648381251 is 15218384646.

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

It is a cyclic number.

It is not a de Polignac number, because 64648381251 - 2¹ = 64648381249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64648381251.

It is not an unprimeable number, because it can be changed into a prime (64648383251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151756551 + ... + 151756976.

It is an arithmetic number, because the mean of its divisors is an integer number (10926487008).

Almost surely, 2^64648381251 is an apocalyptic number.

64648381251 is a deficient number, since it is larger than the sum of its proper divisors (22763514813).

64648381251 is a wasteful number, since it uses less digits than its factorization.

64648381251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303513601.

The product of its digits is 1105920, while the sum is 48.

The spelling of 64648381251 in words is "sixty-four billion, six hundred forty-eight million, three hundred eighty-one thousand, two hundred fifty-one".