61115919979088 has 160 divisors (see below), whose sum is σ = 131980422712320. Its totient is φ = 27225714032640.

The previous prime is 61115919979031. The next prime is 61115919979111. The reversal of 61115919979088 is 88097991951116.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8759623856 + ... + 8759630832.

It is an arithmetic number, because the mean of its divisors is an integer number (824877641952).

Almost surely, 2^{61115919979088} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61115919979088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65990211356160).

61115919979088 is an abundant number, since it is smaller than the sum of its proper divisors (70864502733232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61115919979088 is a wasteful number, since it uses less digits than its factorization.

61115919979088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10405 (or 10399 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 74.

The spelling of 61115919979088 in words is "sixty-one trillion, one hundred fifteen billion, nine hundred nineteen million, nine hundred seventy-nine thousand, eighty-eight".