61336616521 has 4 divisors (see below), whose sum is σ = 61338033792. Its totient is φ = 61335199252.

The previous prime is 61336616507. The next prime is 61336616527. The reversal of 61336616521 is 12561663316.

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 61336616521 - 2¹⁷ = 61336485449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61336616527) 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, 641605 + ... + 730978.

It is an arithmetic number, because the mean of its divisors is an integer number (15334508448).

Almost surely, 2^61336616521 is an apocalyptic number.

It is an amenable number.

61336616521 is a deficient number, since it is larger than the sum of its proper divisors (1417271).

61336616521 is a wasteful number, since it uses less digits than its factorization.

61336616521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417270.

The product of its digits is 116640, while the sum is 40.

The spelling of 61336616521 in words is "sixty-one billion, three hundred thirty-six million, six hundred sixteen thousand, five hundred twenty-one".