1201111099965 has 64 divisors (see below), whose sum is σ = 2444414353920. Its totient is φ = 548165491200.

The previous prime is 1201111099933. The next prime is 1201111099987. The reversal of 1201111099965 is 5699901111021.

It is a happy number.

It is not a de Polignac number, because 1201111099965 - 2⁵ = 1201111099933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201111099965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 489474 + ... + 1625363.

It is an arithmetic number, because the mean of its divisors is an integer number (38193974280).

Almost surely, 2^{1201111099965} is an apocalyptic number.

1201111099965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1201111099965 is an abundant number, since it is smaller than the sum of its proper divisors (1243303253955).

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

1201111099965 is a wasteful number, since it uses less digits than its factorization.

1201111099965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115459 (or 2115453 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 45.

The spelling of 1201111099965 in words is "one trillion, two hundred one billion, one hundred eleven million, ninety-nine thousand, nine hundred sixty-five".