1219779265155 has 32 divisors (see below), whose sum is σ = 2129572505088. Its totient is φ = 591268339200.

The previous prime is 1219779265121. The next prime is 1219779265157. The reversal of 1219779265155 is 5515629779121.

It is not a de Polignac number, because 1219779265155 - 2⁷ = 1219779265027 is a prime.

It is a super-2 number, since 2×1219779265155² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1219779265157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171799 + ... + 1571328.

It is an arithmetic number, because the mean of its divisors is an integer number (66549140784).

Almost surely, 2^{1219779265155} is an apocalyptic number.

1219779265155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1219779265155 is a deficient number, since it is larger than the sum of its proper divisors (909793239933).

1219779265155 is a wasteful number, since it uses less digits than its factorization.

1219779265155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747387.

The product of its digits is 11907000, while the sum is 60.

The spelling of 1219779265155 in words is "one trillion, two hundred nineteen billion, seven hundred seventy-nine million, two hundred sixty-five thousand, one hundred fifty-five".