1280661632101 has 4 divisors (see below), whose sum is σ = 1281868665804. Its totient is φ = 1279454598400.

The previous prime is 1280661632053. The next prime is 1280661632119. The reversal of 1280661632101 is 1012361660821.

It is a happy number.

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 481255763076 + 799405869025 = 693726^2 + 894095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280661632101 - 2⁹ = 1280661631589 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 (1280661632161) 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 3 ways as a sum of consecutive naturals, for example, 603515260 + ... + 603517381.

It is an arithmetic number, because the mean of its divisors is an integer number (320467166451).

Almost surely, 2^{1280661632101} is an apocalyptic number.

It is an amenable number.

1280661632101 is a deficient number, since it is larger than the sum of its proper divisors (1207033703).

1280661632101 is a wasteful number, since it uses less digits than its factorization.

1280661632101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207033702.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 1280661632101 in words is "one trillion, two hundred eighty billion, six hundred sixty-one million, six hundred thirty-two thousand, one hundred one".