1220405544135 has 48 divisors (see below), whose sum is σ = 2138211784800. Its totient is φ = 643861094400.

The previous prime is 1220405544067. The next prime is 1220405544143. The reversal of 1220405544135 is 5314455040221.

1220405544135 is a `hidden beast` number, since 1 + 2 + 20 + 40 + 554 + 41 + 3 + 5 = 666.

It is not a de Polignac number, because 1220405544135 - 2¹⁷ = 1220405413063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220405544135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9095535 + ... + 9228735.

It is an arithmetic number, because the mean of its divisors is an integer number (44546078850).

Almost surely, 2^{1220405544135} is an apocalyptic number.

1220405544135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220405544135 is a deficient number, since it is larger than the sum of its proper divisors (917806240665).

1220405544135 is a wasteful number, since it uses less digits than its factorization.

1220405544135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135408 (or 135405 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 1220405544135 in words is "one trillion, two hundred twenty billion, four hundred five million, five hundred forty-four thousand, one hundred thirty-five".