61798767534 has 64 divisors (see below), whose sum is σ = 157139827200. Its totient is φ = 17635351104.

The previous prime is 61798767491. The next prime is 61798767571. The reversal of 61798767534 is 43576789716.

61798767534 is a `hidden beast` number, since 6 + 1 + 7 + 98 + 7 + 6 + 7 + 534 = 666.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213762 + ... + 411450.

It is an arithmetic number, because the mean of its divisors is an integer number (2455309800).

Almost surely, 2^61798767534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61798767534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78569913600).

61798767534 is an abundant number, since it is smaller than the sum of its proper divisors (95341059666).

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

61798767534 is a wasteful number, since it uses less digits than its factorization.

61798767534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198534 (or 198528 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 63.

The spelling of 61798767534 in words is "sixty-one billion, seven hundred ninety-eight million, seven hundred sixty-seven thousand, five hundred thirty-four".