1461662661637 has 2 divisors, whose sum is σ = 1461662661638. Its totient is φ = 1461662661636.

The previous prime is 1461662661619. The next prime is 1461662661647. The reversal of 1461662661637 is 7361662661641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1433733232996 + 27929428641 = 1197386^2 + 167121^2 .

It is an emirp because it is prime and its reverse (7361662661641) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1461662661637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461662661647) 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 as a sum of consecutive naturals, namely, 730831330818 + 730831330819.

It is an arithmetic number, because the mean of its divisors is an integer number (730831330819).

Almost surely, 2^{1461662661637} is an apocalyptic number.

It is an amenable number.

1461662661637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461662661637 is an equidigital number, since it uses as much as digits as its factorization.

1461662661637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 55.

The spelling of 1461662661637 in words is "one trillion, four hundred sixty-one billion, six hundred sixty-two million, six hundred sixty-one thousand, six hundred thirty-seven".