61871587599 has 16 divisors (see below), whose sum is σ = 82908693504. Its totient is φ = 41041440000.

The previous prime is 61871587573. The next prime is 61871587639. The reversal of 61871587599 is 99578517816.

It is a Cunningham number, because it is equal to 248740²-1.

It is not a de Polignac number, because 61871587599 - 2³¹ = 59724103951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61871587399) 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 15 ways as a sum of consecutive naturals, for example, 704767 + ... + 787679.

It is an arithmetic number, because the mean of its divisors is an integer number (5181793344).

Almost surely, 2^61871587599 is an apocalyptic number.

61871587599 is a deficient number, since it is larger than the sum of its proper divisors (21037105905).

61871587599 is a wasteful number, since it uses less digits than its factorization.

61871587599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84158.

The product of its digits is 38102400, while the sum is 66.

The spelling of 61871587599 in words is "sixty-one billion, eight hundred seventy-one million, five hundred eighty-seven thousand, five hundred ninety-nine".