61424507081 has 12 divisors (see below), whose sum is σ = 73384162308. Its totient is φ = 51226614432.

The previous prime is 61424507051. The next prime is 61424507093. The reversal of 61424507081 is 18070542416.

It can be written as a sum of positive squares in 2 ways, for example, as 33668947081 + 27755560000 = 183491^2 + 166600^2 .

It is not a de Polignac number, because 61424507081 - 2⁶ = 61424507017 is a prime.

It is a super-2 number, since 2×61424507081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61424507051) 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, 16938206 + ... + 16941831.

It is an arithmetic number, because the mean of its divisors is an integer number (6115346859).

Almost surely, 2^61424507081 is an apocalyptic number.

It is an amenable number.

61424507081 is a deficient number, since it is larger than the sum of its proper divisors (11959655227).

61424507081 is a wasteful number, since it uses less digits than its factorization.

61424507081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33880088 (or 33880081 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 61424507081 in words is "sixty-one billion, four hundred twenty-four million, five hundred seven thousand, eighty-one".