131435025666 has 64 divisors (see below), whose sum is σ = 318142328832. Its totient is φ = 35338597632.

The previous prime is 131435025563. The next prime is 131435025671. The reversal of 131435025666 is 666520534131.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8265175 + ... + 8281061.

It is an arithmetic number, because the mean of its divisors is an integer number (4970973888).

Almost surely, 2^131435025666 is an apocalyptic number.

131435025666 is an abundant number, since it is smaller than the sum of its proper divisors (186707303166).

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

131435025666 is a wasteful number, since it uses less digits than its factorization.

131435025666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27503.

The product of its (nonzero) digits is 388800, while the sum is 42.

Adding to 131435025666 its reverse (666520534131), we get a palindrome (797955559797).

The spelling of 131435025666 in words is "one hundred thirty-one billion, four hundred thirty-five million, twenty-five thousand, six hundred sixty-six".