1091222655720 has 64 divisors (see below), whose sum is σ = 3284194343040. Its totient is φ = 290057030400.

The previous prime is 1091222655713. The next prime is 1091222655727. The reversal of 1091222655720 is 275562221901.

1091222655720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1091222655713) and next prime (1091222655727).

It is not an unprimeable number, because it can be changed into a prime (1091222655727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14582491 + ... + 14657130.

It is an arithmetic number, because the mean of its divisors is an integer number (51315536610).

Almost surely, 2^{1091222655720} is an apocalyptic number.

1091222655720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091222655720 is an abundant number, since it is smaller than the sum of its proper divisors (2192971687320).

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

1091222655720 is a wasteful number, since it uses less digits than its factorization.

1091222655720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29239946 (or 29239942 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 1091222655720 in words is "one trillion, ninety-one billion, two hundred twenty-two million, six hundred fifty-five thousand, seven hundred twenty".