61551560827 has 4 divisors (see below), whose sum is σ = 64791116680. Its totient is φ = 58312004976.

The previous prime is 61551560813. The next prime is 61551560831. The reversal of 61551560827 is 72806515516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61551560827 - 2¹¹ = 61551558779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61551560327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619777898 + ... + 1619777935.

It is an arithmetic number, because the mean of its divisors is an integer number (16197779170).

Almost surely, 2^61551560827 is an apocalyptic number.

61551560827 is a deficient number, since it is larger than the sum of its proper divisors (3239555853).

61551560827 is a wasteful number, since it uses less digits than its factorization.

61551560827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239555852.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 61551560827 in words is "sixty-one billion, five hundred fifty-one million, five hundred sixty thousand, eight hundred twenty-seven".