61306221133 has 4 divisors (see below), whose sum is σ = 61326914688. Its totient is φ = 61285527580.

The previous prime is 61306221131. The next prime is 61306221149. The reversal of 61306221133 is 33112260316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61306221133 - 2¹ = 61306221131 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61306221131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10342333 + ... + 10348258.

It is an arithmetic number, because the mean of its divisors is an integer number (15331728672).

Almost surely, 2^61306221133 is an apocalyptic number.

It is an amenable number.

61306221133 is a deficient number, since it is larger than the sum of its proper divisors (20693555).

61306221133 is a wasteful number, since it uses less digits than its factorization.

61306221133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20693554.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 61306221133 its reverse (33112260316), we get a palindrome (94418481449).

The spelling of 61306221133 in words is "sixty-one billion, three hundred six million, two hundred twenty-one thousand, one hundred thirty-three".