61803997191612 has 144 divisors (see below), whose sum is σ = 173254621219680. Its totient is φ = 18453045072384.

The previous prime is 61803997191583. The next prime is 61803997191613. The reversal of 61803997191612 is 21619179930816.

61803997191612 is a `hidden beast` number, since 6 + 1 + 8 + 0 + 3 + 9 + 9 + 7 + 1 + 9 + 1 + 612 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61803997191612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61803997191613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1674439 + ... + 11243297.

Almost surely, 2^{61803997191612} 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 61803997191612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86627310609840).

61803997191612 is an abundant number, since it is smaller than the sum of its proper divisors (111450624028068).

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

61803997191612 is a wasteful number, since it uses less digits than its factorization.

61803997191612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9569292 (or 9569287 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 63.

The spelling of 61803997191612 in words is "sixty-one trillion, eight hundred three billion, nine hundred ninety-seven million, one hundred ninety-one thousand, six hundred twelve".