61378039449 has 6 divisors (see below), whose sum is σ = 88657168106. Its totient is φ = 40918692960.

The previous prime is 61378039409. The next prime is 61378039523. The reversal of 61378039449 is 94493087316.

It is a happy number.

61378039449 is a `hidden beast` number, since 6 + 137 + 80 + 394 + 49 = 666.

61378039449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 49677723225 + 11700316224 = 222885^2 + 108168^2 .

It is not a de Polignac number, because 61378039449 - 2⁷ = 61378039321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61378039395 and 61378039404.

It is not an unprimeable number, because it can be changed into a prime (61378039409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3409891072 + ... + 3409891089.

Almost surely, 2^61378039449 is an apocalyptic number.

It is an amenable number.

61378039449 is a deficient number, since it is larger than the sum of its proper divisors (27279128657).

61378039449 is a wasteful number, since it uses less digits than its factorization.

61378039449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819782167 (or 6819782164 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 61378039449 in words is "sixty-one billion, three hundred seventy-eight million, thirty-nine thousand, four hundred forty-nine".