61891374888 has 192 divisors, whose sum is σ = 201631772160. Its totient is φ = 17419064256.

The previous prime is 61891374871. The next prime is 61891374893. The reversal of 61891374888 is 88847319816.

61891374888 is a `hidden beast` number, since 6 + 18 + 9 + 137 + 488 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 877795 + ... + 945677.

It is an arithmetic number, because the mean of its divisors is an integer number (1050165480).

Almost surely, 2^61891374888 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 61891374888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100815886080).

61891374888 is an abundant number, since it is smaller than the sum of its proper divisors (139740397272).

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

61891374888 is a wasteful number, since it uses less digits than its factorization.

61891374888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67978 (or 67962 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 63.

The spelling of 61891374888 in words is "sixty-one billion, eight hundred ninety-one million, three hundred seventy-four thousand, eight hundred eighty-eight".