1661130112440 has 64 divisors (see below), whose sum is σ = 4991600424960. Its totient is φ = 442238244480.

The previous prime is 1661130112423. The next prime is 1661130112517. The reversal of 1661130112440 is 442110311661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1661130112398 and 1661130112407.

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, 11329756 + ... + 11475435.

It is an arithmetic number, because the mean of its divisors is an integer number (77993756640).

Almost surely, 2^{1661130112440} is an apocalyptic number.

1661130112440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661130112440 is an abundant number, since it is smaller than the sum of its proper divisors (3330470312520).

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

1661130112440 is a wasteful number, since it uses less digits than its factorization.

1661130112440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22805812 (or 22805808 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 1661130112440 in words is "one trillion, six hundred sixty-one billion, one hundred thirty million, one hundred twelve thousand, four hundred forty".