61328576681 has 4 divisors (see below), whose sum is σ = 61554881664. Its totient is φ = 61102271700.

The previous prime is 61328576657. The next prime is 61328576693. The reversal of 61328576681 is 18667582316.

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 a de Polignac number, because none of the positive numbers 2^k-61328576681 is a prime.

It is a super-2 number, since 2×61328576681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61328572681) 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, 113152085 + ... + 113152626.

It is an arithmetic number, because the mean of its divisors is an integer number (15388720416).

Almost surely, 2^61328576681 is an apocalyptic number.

It is an amenable number.

61328576681 is a deficient number, since it is larger than the sum of its proper divisors (226304983).

61328576681 is a wasteful number, since it uses less digits than its factorization.

61328576681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226304982.

The product of its digits is 2903040, while the sum is 53.

The spelling of 61328576681 in words is "sixty-one billion, three hundred twenty-eight million, five hundred seventy-six thousand, six hundred eighty-one".