161121335635600 has 60 divisors (see below), whose sum is σ = 387246470544880. Its totient is φ = 64423150416000.

The previous prime is 161121335635553. The next prime is 161121335635633. The reversal of 161121335635600 is 6536533121161.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78307626 + ... + 80338825.

Almost surely, 2^{161121335635600} is an apocalyptic number.

161121335635600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161121335635600 is an abundant number, since it is smaller than the sum of its proper divisors (226125134909280).

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

161121335635600 is a wasteful number, since it uses less digits than its factorization.

161121335635600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158649008 (or 158648997 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

Adding to 161121335635600 its reverse (6536533121161), we get a palindrome (167657868756761).

The spelling of 161121335635600 in words is "one hundred sixty-one trillion, one hundred twenty-one billion, three hundred thirty-five million, six hundred thirty-five thousand, six hundred".