1178198604721 has 16 divisors (see below), whose sum is σ = 1212827297920. Its totient is φ = 1143717719040.

The previous prime is 1178198604689. The next prime is 1178198604799. The reversal of 1178198604721 is 1274068918711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1178198604721 - 2⁵ = 1178198604689 is a prime.

It is a super-2 number, since 2×1178198604721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1178198604421) 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, 134939926 + ... + 134948656.

It is an arithmetic number, because the mean of its divisors is an integer number (75801706120).

Almost surely, 2^{1178198604721} is an apocalyptic number.

It is an amenable number.

1178198604721 is a deficient number, since it is larger than the sum of its proper divisors (34628693199).

1178198604721 is an equidigital number, since it uses as much as digits as its factorization.

1178198604721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16744.

The product of its (nonzero) digits is 1354752, while the sum is 55.

The spelling of 1178198604721 in words is "one trillion, one hundred seventy-eight billion, one hundred ninety-eight million, six hundred four thousand, seven hundred twenty-one".