1171277379550 has 12 divisors (see below), whose sum is σ = 2178575926056. Its totient is φ = 468510951800.

The previous prime is 1171277379539. The next prime is 1171277379551. The reversal of 1171277379550 is 559737721711.

It is a junction number, because it is equal to n+sod(n) for n = 1171277379491 and 1171277379500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171277379551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11712773746 + ... + 11712773845.

It is an arithmetic number, because the mean of its divisors is an integer number (181547993838).

Almost surely, 2^{1171277379550} is an apocalyptic number.

1171277379550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1171277379550 is a deficient number, since it is larger than the sum of its proper divisors (1007298546506).

1171277379550 is a wasteful number, since it uses less digits than its factorization.

1171277379550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23425547603 (or 23425547598 counting only the distinct ones).

The product of its (nonzero) digits is 3241350, while the sum is 55.

The spelling of 1171277379550 in words is "one trillion, one hundred seventy-one billion, two hundred seventy-seven million, three hundred seventy-nine thousand, five hundred fifty".