61610660149 has 4 divisors (see below), whose sum is σ = 63275813164. Its totient is φ = 59945507136.

The previous prime is 61610660141. The next prime is 61610660161. The reversal of 61610660149 is 94106601616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51616659249 + 9994000900 = 227193^2 + 99970^2 .

It is a cyclic number.

It is not a de Polignac number, because 61610660149 - 2³ = 61610660141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61610660141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832576452 + ... + 832576525.

It is an arithmetic number, because the mean of its divisors is an integer number (15818953291).

Almost surely, 2^61610660149 is an apocalyptic number.

It is an amenable number.

61610660149 is a deficient number, since it is larger than the sum of its proper divisors (1665153015).

61610660149 is a wasteful number, since it uses less digits than its factorization.

61610660149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665153014.

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 61610660149 in words is "sixty-one billion, six hundred ten million, six hundred sixty thousand, one hundred forty-nine".