651581799901 has 4 divisors (see below), whose sum is σ = 652549975612. Its totient is φ = 650613624192.

The previous prime is 651581799899. The next prime is 651581799923. The reversal of 651581799901 is 109997185156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214277335801 + 437304464100 = 462901^2 + 661290^2 .

It is a cyclic number.

It is not a de Polignac number, because 651581799901 - 2¹ = 651581799899 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 651581799901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651581799101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484086846 + ... + 484088191.

It is an arithmetic number, because the mean of its divisors is an integer number (163137493903).

Almost surely, 2^651581799901 is an apocalyptic number.

It is an amenable number.

651581799901 is a deficient number, since it is larger than the sum of its proper divisors (968175711).

651581799901 is an equidigital number, since it uses as much as digits as its factorization.

651581799901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968175710.

The product of its (nonzero) digits is 6123600, while the sum is 61.

The spelling of 651581799901 in words is "six hundred fifty-one billion, five hundred eighty-one million, seven hundred ninety-nine thousand, nine hundred one".