1581610506117 has 16 divisors (see below), whose sum is σ = 2200743285120. Its totient is φ = 1008452436992.

The previous prime is 1581610506101. The next prime is 1581610506127. The reversal of 1581610506117 is 7116050161851.

It is a cyclic number.

It is not a de Polignac number, because 1581610506117 - 2⁴ = 1581610506101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581610506127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623892 + ... + 1884797.

It is an arithmetic number, because the mean of its divisors is an integer number (137546455320).

Almost surely, 2^{1581610506117} is an apocalyptic number.

It is an amenable number.

1581610506117 is a deficient number, since it is larger than the sum of its proper divisors (619132779003).

1581610506117 is a wasteful number, since it uses less digits than its factorization.

1581610506117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517852.

The product of its (nonzero) digits is 50400, while the sum is 42.

Adding to 1581610506117 its reverse (7116050161851), we get a palindrome (8697660667968).

The spelling of 1581610506117 in words is "one trillion, five hundred eighty-one billion, six hundred ten million, five hundred six thousand, one hundred seventeen".