651110240261 has 8 divisors (see below), whose sum is σ = 701370083064. Its totient is φ = 600875317440.

The previous prime is 651110240243. The next prime is 651110240281. The reversal of 651110240261 is 162042011156.

It can be written as a sum of positive squares in 4 ways, for example, as 59587739236 + 591522501025 = 244106^2 + 769105^2 .

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 651110240261 - 2¹⁸ = 651109978117 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 (651110240201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6175706 + ... + 6280251.

It is an arithmetic number, because the mean of its divisors is an integer number (87671260383).

Almost surely, 2^651110240261 is an apocalyptic number.

It is an amenable number.

651110240261 is a deficient number, since it is larger than the sum of its proper divisors (50259842803).

651110240261 is a wasteful number, since it uses less digits than its factorization.

651110240261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12459991.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 651110240261 in words is "six hundred fifty-one billion, one hundred ten million, two hundred forty thousand, two hundred sixty-one".