61797879815 has 8 divisors (see below), whose sum is σ = 84751378080. Its totient is φ = 42375688992.

The previous prime is 61797879763. The next prime is 61797879823. The reversal of 61797879815 is 51897879716.

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

It is not a de Polignac number, because 61797879815 - 2¹² = 61797875719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 882826820 + ... + 882826889.

It is an arithmetic number, because the mean of its divisors is an integer number (10593922260).

Almost surely, 2^61797879815 is an apocalyptic number.

61797879815 is a deficient number, since it is larger than the sum of its proper divisors (22953498265).

61797879815 is a wasteful number, since it uses less digits than its factorization.

61797879815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765653721.

The product of its digits is 53343360, while the sum is 68.

Subtracting from 61797879815 its reverse (51897879716), we obtain a palindrome (9900000099).

The spelling of 61797879815 in words is "sixty-one billion, seven hundred ninety-seven million, eight hundred seventy-nine thousand, eight hundred fifteen".