66310250261 has 12 divisors (see below), whose sum is σ = 68585648076. Its totient is φ = 64108128960.

The previous prime is 66310250243. The next prime is 66310250267. The reversal of 66310250261 is 16205201366.

It can be written as a sum of positive squares in 2 ways, for example, as 42753832900 + 23556417361 = 206770^2 + 153481^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66310250261 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 (66310250267) 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 11 ways as a sum of consecutive naturals, for example, 959315 + ... + 1026111.

It is an arithmetic number, because the mean of its divisors is an integer number (5715470673).

Almost surely, 2^66310250261 is an apocalyptic number.

It is an amenable number.

66310250261 is a deficient number, since it is larger than the sum of its proper divisors (2275397815).

66310250261 is a wasteful number, since it uses less digits than its factorization.

66310250261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67892 (or 67861 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 66310250261 in words is "sixty-six billion, three hundred ten million, two hundred fifty thousand, two hundred sixty-one".