61387150985 has 16 divisors (see below), whose sum is σ = 75512198160. Its totient is φ = 47879592960.

The previous prime is 61387150973. The next prime is 61387150997. The reversal of 61387150985 is 58905178316.

It is an interprime number because it is at equal distance from previous prime (61387150973) and next prime (61387150997).

It can be written as a sum of positive squares in 8 ways, for example, as 5620800784 + 55766350201 = 74972^2 + 236149^2 .

It is not a de Polignac number, because 61387150985 - 2⁶ = 61387150921 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 205781 + ... + 406349.

It is an arithmetic number, because the mean of its divisors is an integer number (4719512385).

Almost surely, 2^61387150985 is an apocalyptic number.

It is an amenable number.

61387150985 is a deficient number, since it is larger than the sum of its proper divisors (14125047175).

61387150985 is a wasteful number, since it uses less digits than its factorization.

61387150985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202108.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 61387150985 in words is "sixty-one billion, three hundred eighty-seven million, one hundred fifty thousand, nine hundred eighty-five".