61442206281 has 12 divisors (see below), whose sum is σ = 88787827440. Its totient is φ = 40943944440.

The previous prime is 61442206249. The next prime is 61442206297. The reversal of 61442206281 is 18260224416.

61442206281 is a `hidden beast` number, since 6 + 1 + 4 + 4 + 2 + 20 + 628 + 1 = 666.

It is not a de Polignac number, because 61442206281 - 2⁵ = 61442206249 is a prime.

It is a super-2 number, since 2×61442206281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61442204281) 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 11 ways as a sum of consecutive naturals, for example, 1438315 + ... + 1480416.

It is an arithmetic number, because the mean of its divisors is an integer number (7398985620).

Almost surely, 2^61442206281 is an apocalyptic number.

It is an amenable number.

61442206281 is a deficient number, since it is larger than the sum of its proper divisors (27345621159).

61442206281 is a wasteful number, since it uses less digits than its factorization.

61442206281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921076 (or 2921073 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 61442206281 in words is "sixty-one billion, four hundred forty-two million, two hundred six thousand, two hundred eighty-one".