61281311172 has 12 divisors (see below), whose sum is σ = 142989726096. Its totient is φ = 20427103720.

The previous prime is 61281311141. The next prime is 61281311219. The reversal of 61281311172 is 27111318216.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553387954 + ... + 2553387977.

It is an arithmetic number, because the mean of its divisors is an integer number (11915810508).

Almost surely, 2^61281311172 is an apocalyptic number.

It is an amenable number.

61281311172 is an abundant number, since it is smaller than the sum of its proper divisors (81708414924).

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

61281311172 is a wasteful number, since it uses less digits than its factorization.

61281311172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106775938 (or 5106775936 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

Adding to 61281311172 its reverse (27111318216), we get a palindrome (88392629388).

The spelling of 61281311172 in words is "sixty-one billion, two hundred eighty-one million, three hundred eleven thousand, one hundred seventy-two".