1661030564120 has 32 divisors (see below), whose sum is σ = 3738861421920. Its totient is φ = 664137976320.

The previous prime is 1661030564107. The next prime is 1661030564147. The reversal of 1661030564120 is 214650301661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8472161 + ... + 8666000.

It is an arithmetic number, because the mean of its divisors is an integer number (116839419435).

Almost surely, 2^{1661030564120} is an apocalyptic number.

1661030564120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661030564120 is an abundant number, since it is smaller than the sum of its proper divisors (2077830857800).

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

1661030564120 is a wasteful number, since it uses less digits than its factorization.

1661030564120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17140595 (or 17140591 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 1661030564120 its reverse (214650301661), we get a palindrome (1875680865781).

The spelling of 1661030564120 in words is "one trillion, six hundred sixty-one billion, thirty million, five hundred sixty-four thousand, one hundred twenty".