52161121661572 has 96 divisors (see below), whose sum is σ = 114328160722944. Its totient is φ = 20229305644800.

The previous prime is 52161121661569. The next prime is 52161121661609. The reversal of 52161121661572 is 27516612116125.

It is a super-2 number, since 2×52161121661572² (a number of 28 digits) contains 22 as substring.

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, 783719848 + ... + 783786400.

It is an arithmetic number, because the mean of its divisors is an integer number (1190918340864).

Almost surely, 2^{52161121661572} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52161121661572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57164080361472).

52161121661572 is an abundant number, since it is smaller than the sum of its proper divisors (62167039061372).

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

52161121661572 is a wasteful number, since it uses less digits than its factorization.

52161121661572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78209 (or 78207 counting only the distinct ones).

The product of its digits is 302400, while the sum is 46.

Adding to 52161121661572 its reverse (27516612116125), we get a palindrome (79677733777697).

The spelling of 52161121661572 in words is "fifty-two trillion, one hundred sixty-one billion, one hundred twenty-one million, six hundred sixty-one thousand, five hundred seventy-two".