61442642103263 has 4 divisors (see below), whose sum is σ = 64114061325168. Its totient is φ = 58771222881360.

The previous prime is 61442642103251. The next prime is 61442642103277. The reversal of 61442642103263 is 36230124624416.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61442642103263 - 2¹⁶ = 61442642037727 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 (61442642103223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1335709610918 + ... + 1335709610963.

It is an arithmetic number, because the mean of its divisors is an integer number (16028515331292).

Almost surely, 2^{61442642103263} is an apocalyptic number.

61442642103263 is a deficient number, since it is larger than the sum of its proper divisors (2671419221905).

61442642103263 is a wasteful number, since it uses less digits than its factorization.

61442642103263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671419221904.

The product of its (nonzero) digits is 995328, while the sum is 44.

Adding to 61442642103263 its reverse (36230124624416), we get a palindrome (97672766727679).

The spelling of 61442642103263 in words is "sixty-one trillion, four hundred forty-two billion, six hundred forty-two million, one hundred three thousand, two hundred sixty-three".