64510318261 has 16 divisors (see below), whose sum is σ = 67034780928. Its totient is φ = 62036078400.

The previous prime is 64510318241. The next prime is 64510318273. The reversal of 64510318261 is 16281301546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64510318261 - 2¹³ = 64510310069 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 64510318261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64510318211) 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 15 ways as a sum of consecutive naturals, for example, 2772271 + ... + 2795443.

It is an arithmetic number, because the mean of its divisors is an integer number (4189673808).

Almost surely, 2^64510318261 is an apocalyptic number.

64510318261 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64510318261 is a deficient number, since it is larger than the sum of its proper divisors (2524462667).

64510318261 is a wasteful number, since it uses less digits than its factorization.

64510318261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24252.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 64510318261 in words is "sixty-four billion, five hundred ten million, three hundred eighteen thousand, two hundred sixty-one".