1178076661861 has 4 divisors (see below), whose sum is σ = 1285174540224. Its totient is φ = 1070978783500.

The previous prime is 1178076661841. The next prime is 1178076661919. The reversal of 1178076661861 is 1681666708711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1178076661861 - 2¹⁹ = 1178076137573 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1178076661796 and 1178076661805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178076661841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53548939165 + ... + 53548939186.

It is an arithmetic number, because the mean of its divisors is an integer number (321293635056).

Almost surely, 2^{1178076661861} is an apocalyptic number.

1178076661861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1178076661861 is a deficient number, since it is larger than the sum of its proper divisors (107097878363).

1178076661861 is a wasteful number, since it uses less digits than its factorization.

1178076661861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107097878362.

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 1178076661861 in words is "one trillion, one hundred seventy-eight billion, seventy-six million, six hundred sixty-one thousand, eight hundred sixty-one".