61917787008 has 1152 divisors, whose sum is σ = 243797299200. Its totient is φ = 14719795200.

The previous prime is 61917786991. The next prime is 61917787027. The reversal of 61917787008 is 80078771916.

61917787008 is a `hidden beast` number, since 619 + 17 + 7 + 8 + 7 + 0 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a congruent number.

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 143 ways as a sum of consecutive naturals, for example, 695705428 + ... + 695705516.

It is an arithmetic number, because the mean of its divisors is an integer number (211629600).

Almost surely, 2^61917787008 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 61917787008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121898649600).

61917787008 is an abundant number, since it is smaller than the sum of its proper divisors (181879512192).

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

61917787008 is a wasteful number, since it uses less digits than its factorization.

61917787008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 54.

The spelling of 61917787008 in words is "sixty-one billion, nine hundred seventeen million, seven hundred eighty-seven thousand, eight".