61836986478366 has 128 divisors (see below), whose sum is σ = 150196890816000. Its totient is φ = 18702360449280.

The previous prime is 61836986478361. The next prime is 61836986478367. The reversal of 61836986478366 is 66387468963816.

61836986478366 is a `hidden beast` number, since 6 + 1 + 8 + 3 + 6 + 9 + 86 + 478 + 3 + 66 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61836986478361) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3543861210 + ... + 3543878658.

It is an arithmetic number, because the mean of its divisors is an integer number (1173413209500).

Almost surely, 2^{61836986478366} is an apocalyptic number.

61836986478366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61836986478366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75098445408000).

61836986478366 is an abundant number, since it is smaller than the sum of its proper divisors (88359904337634).

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

61836986478366 is a wasteful number, since it uses less digits than its factorization.

61836986478366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28631 (or 28625 counting only the distinct ones).

The product of its digits is 9029615616, while the sum is 81.

The spelling of 61836986478366 in words is "sixty-one trillion, eight hundred thirty-six billion, nine hundred eighty-six million, four hundred seventy-eight thousand, three hundred sixty-six".