61450999457 has 4 divisors (see below), whose sum is σ = 61487820180. Its totient is φ = 61414178736.

The previous prime is 61450999447. The next prime is 61450999481. The reversal of 61450999457 is 75499905416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42149732416 + 19301267041 = 205304^2 + 138929^2 .

It is a cyclic number.

It is not a de Polignac number, because 61450999457 - 2²² = 61446805153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61450999396 and 61450999405.

It is not an unprimeable number, because it can be changed into a prime (61450999447) 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 3 ways as a sum of consecutive naturals, for example, 18407858 + ... + 18411195.

It is an arithmetic number, because the mean of its divisors is an integer number (15371955045).

Almost surely, 2^61450999457 is an apocalyptic number.

It is an amenable number.

61450999457 is a deficient number, since it is larger than the sum of its proper divisors (36820723).

61450999457 is a wasteful number, since it uses less digits than its factorization.

61450999457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36820722.

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 61450999457 in words is "sixty-one billion, four hundred fifty million, nine hundred ninety-nine thousand, four hundred fifty-seven".