61407878344 has 8 divisors (see below), whose sum is σ = 115139771910. Its totient is φ = 30703939168.

The previous prime is 61407878339. The next prime is 61407878347. The reversal of 61407878344 is 44387870416.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52564732900 + 8843145444 = 229270^2 + 94038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 61407878291 and 61407878300.

It is not an unprimeable number, because it can be changed into a prime (61407878347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3837992389 + ... + 3837992404.

Almost surely, 2^61407878344 is an apocalyptic number.

It is an amenable number.

61407878344 is a deficient number, since it is larger than the sum of its proper divisors (53731893566).

61407878344 is a wasteful number, since it uses less digits than its factorization.

61407878344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7675984799 (or 7675984795 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 61407878344 in words is "sixty-one billion, four hundred seven million, eight hundred seventy-eight thousand, three hundred forty-four".