61144229485989 has 24 divisors (see below), whose sum is σ = 95145741530112. Its totient is φ = 37614362718240.

The previous prime is 61144229485979. The next prime is 61144229486017. The reversal of 61144229485989 is 98958492244116.

It is a happy number.

61144229485989 is a `hidden beast` number, since 6 + 1 + 1 + 4 + 4 + 2 + 29 + 4 + 8 + 598 + 9 = 666.

It is not a de Polignac number, because 61144229485989 - 2¹¹ = 61144229483941 is a prime.

It is a super-2 number, since 2×61144229485989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61144229485979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88929877 + ... + 89614794.

It is an arithmetic number, because the mean of its divisors is an integer number (3964405897088).

Almost surely, 2^{61144229485989} is an apocalyptic number.

It is an amenable number.

61144229485989 is a deficient number, since it is larger than the sum of its proper divisors (34001512044123).

61144229485989 is a wasteful number, since it uses less digits than its factorization.

61144229485989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178547617 (or 178547614 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 72.

The spelling of 61144229485989 in words is "sixty-one trillion, one hundred forty-four billion, two hundred twenty-nine million, four hundred eighty-five thousand, nine hundred eighty-nine".