42661495949 has 8 divisors (see below), whose sum is σ = 43302607128. Its totient is φ = 42024673600.

The previous prime is 42661495907. The next prime is 42661495951. The reversal of 42661495949 is 94959416624.

It can be written as a sum of positive squares in 4 ways, for example, as 34454041924 + 8207454025 = 185618^2 + 90595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42661495949 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 (42661495969) 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 7 ways as a sum of consecutive naturals, for example, 1052162 + ... + 1091955.

It is an arithmetic number, because the mean of its divisors is an integer number (5412825891).

Almost surely, 2^42661495949 is an apocalyptic number.

It is an amenable number.

42661495949 is a deficient number, since it is larger than the sum of its proper divisors (641111179).

42661495949 is a wasteful number, since it uses less digits than its factorization.

42661495949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144415.

The product of its digits is 16796160, while the sum is 59.

The spelling of 42661495949 in words is "forty-two billion, six hundred sixty-one million, four hundred ninety-five thousand, nine hundred forty-nine".