61693487856 has 1080 divisors, whose sum is σ = 243881453088. Its totient is φ = 14233190400.

The previous prime is 61693487839. The next prime is 61693487887. The reversal of 61693487856 is 65878439616.

61693487856 is a `hidden beast` number, since 6 + 16 + 93 + 487 + 8 + 56 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 61693487793 and 61693487802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 845116236 + ... + 845116308.

Almost surely, 2^61693487856 is an apocalyptic number.

61693487856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61693487856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121940726544).

61693487856 is an abundant number, since it is smaller than the sum of its proper divisors (182187965232).

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

61693487856 is a wasteful number, since it uses less digits than its factorization.

61693487856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 150 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 61693487856 in words is "sixty-one billion, six hundred ninety-three million, four hundred eighty-seven thousand, eight hundred fifty-six".