61406439973 has 2 divisors, whose sum is σ = 61406439974. Its totient is φ = 61406439972.

The previous prime is 61406439851. The next prime is 61406439979. The reversal of 61406439973 is 37993460416.

61406439973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59793453729 + 1612986244 = 244527^2 + 40162^2 .

It is a cyclic number.

It is not a de Polignac number, because 61406439973 - 2⁹ = 61406439461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61406439973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61406439979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703219986 + 30703219987.

It is an arithmetic number, because the mean of its divisors is an integer number (30703219987).

Almost surely, 2^61406439973 is an apocalyptic number.

It is an amenable number.

61406439973 is a deficient number, since it is larger than the sum of its proper divisors (1).

61406439973 is an equidigital number, since it uses as much as digits as its factorization.

61406439973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 52.

The spelling of 61406439973 in words is "sixty-one billion, four hundred six million, four hundred thirty-nine thousand, nine hundred seventy-three".