1161777880 has 16 divisors (see below), whose sum is σ = 2614000320. Its totient is φ = 464711136.

The previous prime is 1161777853. The next prime is 1161777889. The reversal of 1161777880 is 887771611.

It is a self number, because there is not a number n which added to its sum of digits gives 1161777880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161777889) 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, 14522184 + ... + 14522263.

It is an arithmetic number, because the mean of its divisors is an integer number (163375020).

Almost surely, 2^1161777880 is an apocalyptic number.

1161777880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161777880 is an abundant number, since it is smaller than the sum of its proper divisors (1452222440).

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

1161777880 is a wasteful number, since it uses less digits than its factorization.

1161777880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29044458 (or 29044454 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 46.

The square root of 1161777880 is about 34084.8629159632. The cubic root of 1161777880 is about 1051.2540963993.

The spelling of 1161777880 in words is "one billion, one hundred sixty-one million, seven hundred seventy-seven thousand, eight hundred eighty".