61138868153 has 24 divisors (see below), whose sum is σ = 71161322880. Its totient is φ = 52082277120.

The previous prime is 61138868069. The next prime is 61138868171. The reversal of 61138868153 is 35186883116.

It is a happy number.

It is not a de Polignac number, because 61138868153 - 2¹⁰ = 61138867129 is a prime.

It is a super-2 number, since 2×61138868153² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61138868053) 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 23 ways as a sum of consecutive naturals, for example, 686000 + ... + 769982.

It is an arithmetic number, because the mean of its divisors is an integer number (2965055120).

Almost surely, 2^61138868153 is an apocalyptic number.

It is an amenable number.

61138868153 is a deficient number, since it is larger than the sum of its proper divisors (10022454727).

61138868153 is a wasteful number, since it uses less digits than its factorization.

61138868153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84257 (or 84240 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The spelling of 61138868153 in words is "sixty-one billion, one hundred thirty-eight million, eight hundred sixty-eight thousand, one hundred fifty-three".