1220435135540 has 48 divisors (see below), whose sum is σ = 2645729393664. Its totient is φ = 472401331200.

The previous prime is 1220435135497. The next prime is 1220435135593. The reversal of 1220435135540 is 455315340221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220435135540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15138017 + ... + 15218423.

It is an arithmetic number, because the mean of its divisors is an integer number (55119362368).

Almost surely, 2^{1220435135540} is an apocalyptic number.

1220435135540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220435135540 is an abundant number, since it is smaller than the sum of its proper divisors (1425294258124).

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

1220435135540 is a wasteful number, since it uses less digits than its factorization.

1220435135540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104928 (or 104926 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 1220435135540 in words is "one trillion, two hundred twenty billion, four hundred thirty-five million, one hundred thirty-five thousand, five hundred forty".