61587718616 has 8 divisors (see below), whose sum is σ = 115476972420. Its totient is φ = 30793859304.

The previous prime is 61587718613. The next prime is 61587718649. The reversal of 61587718616 is 61681778516.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61587718613) 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 as a sum of consecutive naturals, namely, 3849232406 + ... + 3849232421.

Almost surely, 2^61587718616 is an apocalyptic number.

It is an amenable number.

61587718616 is a deficient number, since it is larger than the sum of its proper divisors (53889253804).

61587718616 is a wasteful number, since it uses less digits than its factorization.

61587718616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7698464833 (or 7698464829 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 56.

The spelling of 61587718616 in words is "sixty-one billion, five hundred eighty-seven million, seven hundred eighteen thousand, six hundred sixteen".