61813659887 has 6 divisors (see below), whose sum is σ = 71905686048. Its totient is φ = 52983137004.

The previous prime is 61813659847. The next prime is 61813659893. The reversal of 61813659887 is 78895631816.

It is not a de Polignac number, because 61813659887 - 2¹⁴ = 61813643503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61813659847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 630751583 + ... + 630751680.

It is an arithmetic number, because the mean of its divisors is an integer number (11984281008).

Almost surely, 2^61813659887 is an apocalyptic number.

61813659887 is a deficient number, since it is larger than the sum of its proper divisors (10092026161).

61813659887 is a wasteful number, since it uses less digits than its factorization.

61813659887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261503277 (or 1261503270 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 62.

The spelling of 61813659887 in words is "sixty-one billion, eight hundred thirteen million, six hundred fifty-nine thousand, eight hundred eighty-seven".