61172221611 has 8 divisors (see below), whose sum is σ = 82780320064. Its totient is φ = 40172802120.

The previous prime is 61172221559. The next prime is 61172221613. The reversal of 61172221611 is 11612227116.

61172221611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61172221611 - 2¹⁰ = 61172220587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61172221613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152169505 + ... + 152169906.

It is an arithmetic number, because the mean of its divisors is an integer number (10347540008).

Almost surely, 2^61172221611 is an apocalyptic number.

61172221611 is a deficient number, since it is larger than the sum of its proper divisors (21608098453).

61172221611 is a wasteful number, since it uses less digits than its factorization.

61172221611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304339481.

The product of its digits is 2016, while the sum is 30.

Adding to 61172221611 its reverse (11612227116), we get a palindrome (72784448727).

The spelling of 61172221611 in words is "sixty-one billion, one hundred seventy-two million, two hundred twenty-one thousand, six hundred eleven".