61713681515 has 8 divisors (see below), whose sum is σ = 74065859568. Its totient is φ = 49364650720.

The previous prime is 61713681433. The next prime is 61713681521. The reversal of 61713681515 is 51518631716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61713681515 - 2²⁴ = 61696904299 is a prime.

It is a super-2 number, since 2×61713681515² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 743456 + ... + 822285.

It is an arithmetic number, because the mean of its divisors is an integer number (9258232446).

Almost surely, 2^61713681515 is an apocalyptic number.

61713681515 is a deficient number, since it is larger than the sum of its proper divisors (12352178053).

61713681515 is a wasteful number, since it uses less digits than its factorization.

61713681515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573629.

The product of its digits is 151200, while the sum is 44.

The spelling of 61713681515 in words is "sixty-one billion, seven hundred thirteen million, six hundred eighty-one thousand, five hundred fifteen".