1281847397672 has 8 divisors (see below), whose sum is σ = 2403463870650. Its totient is φ = 640923698832.

The previous prime is 1281847397653. The next prime is 1281847397711. The reversal of 1281847397672 is 2767937481821.

It can be written as a sum of positive squares in only one way, i.e., 1119249738916 + 162597658756 = 1057946^2 + 403234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1281847397672² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1281847397599 and 1281847397608.

It is an unprimeable number.

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, 80115462347 + ... + 80115462362.

Almost surely, 2^{1281847397672} is an apocalyptic number.

It is an amenable number.

1281847397672 is a deficient number, since it is larger than the sum of its proper divisors (1121616472978).

1281847397672 is a wasteful number, since it uses less digits than its factorization.

1281847397672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160230924715 (or 160230924711 counting only the distinct ones).

The product of its digits is 56899584, while the sum is 65.

The spelling of 1281847397672 in words is "one trillion, two hundred eighty-one billion, eight hundred forty-seven million, three hundred ninety-seven thousand, six hundred seventy-two".