1211205150465 has 8 divisors (see below), whose sum is σ = 1937928240768. Its totient is φ = 645976080240.

The previous prime is 1211205150457. The next prime is 1211205150473. The reversal of 1211205150465 is 5640515021121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1211205150457) and next prime (1211205150473).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211205150465 - 2³ = 1211205150457 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40373505001 + ... + 40373505030.

It is an arithmetic number, because the mean of its divisors is an integer number (242241030096).

Almost surely, 2^{1211205150465} is an apocalyptic number.

1211205150465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211205150465 is a deficient number, since it is larger than the sum of its proper divisors (726723090303).

1211205150465 is an equidigital number, since it uses as much as digits as its factorization.

1211205150465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80747010039.

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 1211205150465 in words is "one trillion, two hundred eleven billion, two hundred five million, one hundred fifty thousand, four hundred sixty-five".