1189909909550 has 12 divisors (see below), whose sum is σ = 2213232431856. Its totient is φ = 475963963800.

The previous prime is 1189909909543. The next prime is 1189909909579. The reversal of 1189909909550 is 559099099811.

It is a hoax number, since the sum of its digits (65) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11899099046 + ... + 11899099145.

It is an arithmetic number, because the mean of its divisors is an integer number (184436035988).

Almost surely, 2^{1189909909550} is an apocalyptic number.

1189909909550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1189909909550 is a deficient number, since it is larger than the sum of its proper divisors (1023322522306).

1189909909550 is a wasteful number, since it uses less digits than its factorization.

1189909909550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23798198203 (or 23798198198 counting only the distinct ones).

The product of its (nonzero) digits is 11809800, while the sum is 65.

The spelling of 1189909909550 in words is "one trillion, one hundred eighty-nine billion, nine hundred nine million, nine hundred nine thousand, five hundred fifty".