1178961557820 has 48 divisors (see below), whose sum is σ = 3301382665728. Its totient is φ = 314362100800.

The previous prime is 1178961557777. The next prime is 1178961557831. The reversal of 1178961557820 is 287551698711.

It is a super-2 number, since 2×1178961557820² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171456 + ... + 1545095.

It is an arithmetic number, because the mean of its divisors is an integer number (68778805536).

Almost surely, 2^{1178961557820} is an apocalyptic number.

1178961557820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1178961557820 is an abundant number, since it is smaller than the sum of its proper divisors (2122421107908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1178961557820 is a wasteful number, since it uses less digits than its factorization.

1178961557820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728010 (or 1728008 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 60.

The spelling of 1178961557820 in words is "one trillion, one hundred seventy-eight billion, nine hundred sixty-one million, five hundred fifty-seven thousand, eight hundred twenty".