1298856229561 has 16 divisors (see below), whose sum is σ = 1451370558528. Its totient is φ = 1152137548800.

The previous prime is 1298856229507. The next prime is 1298856229579. The reversal of 1298856229561 is 1659226588921.

It is a cyclic number.

It is not a de Polignac number, because 1298856229561 - 2²⁹ = 1298319358649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1298856229493 and 1298856229502.

It is not an unprimeable number, because it can be changed into a prime (1298856229361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943200 + ... + 1867441.

It is an arithmetic number, because the mean of its divisors is an integer number (90710659908).

Almost surely, 2^{1298856229561} is an apocalyptic number.

1298856229561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1298856229561 is a deficient number, since it is larger than the sum of its proper divisors (152514328967).

1298856229561 is a wasteful number, since it uses less digits than its factorization.

1298856229561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811672.

The product of its digits is 37324800, while the sum is 64.

The spelling of 1298856229561 in words is "one trillion, two hundred ninety-eight billion, eight hundred fifty-six million, two hundred twenty-nine thousand, five hundred sixty-one".