61636737168 has 30 divisors (see below), whose sum is σ = 172497257894. Its totient is φ = 20545579008.

The previous prime is 61636737161. The next prime is 61636737187. The reversal of 61636737168 is 86173763616.

It is a happy number.

61636737168 is a `hidden beast` number, since 616 + 3 + 6 + 7 + 3 + 7 + 16 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61084111104 + 552626064 = 247152^2 + 23508^2 .

It is a super-2 number, since 2×61636737168² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61636737161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214016305 + ... + 214016592.

Almost surely, 2^61636737168 is an apocalyptic number.

It is an amenable number.

61636737168 is an abundant number, since it is smaller than the sum of its proper divisors (110860520726).

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

61636737168 is a wasteful number, since it uses less digits than its factorization.

61636737168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428032911 (or 428032902 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 61636737168 in words is "sixty-one billion, six hundred thirty-six million, seven hundred thirty-seven thousand, one hundred sixty-eight".