1001440561651 has 2 divisors, whose sum is σ = 1001440561652. Its totient is φ = 1001440561650.

The previous prime is 1001440561621. The next prime is 1001440561697. The reversal of 1001440561651 is 1561650441001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1001440561651 - 2²⁷ = 1001306343923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001440561621) 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 as a sum of consecutive naturals, namely, 500720280825 + 500720280826.

It is an arithmetic number, because the mean of its divisors is an integer number (500720280826).

Almost surely, 2^{1001440561651} is an apocalyptic number.

1001440561651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001440561651 is an equidigital number, since it uses as much as digits as its factorization.

1001440561651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 1001440561651 in words is "one trillion, one billion, four hundred forty million, five hundred sixty-one thousand, six hundred fifty-one".