61450369817 has 4 divisors (see below), whose sum is σ = 61505781540. Its totient is φ = 61394958096.

The previous prime is 61450369793. The next prime is 61450369823. The reversal of 61450369817 is 71896305416.

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 15232249561 + 46218120256 = 123419^2 + 214984^2 .

It is a cyclic number.

It is not a de Polignac number, because 61450369817 - 2¹⁸ = 61450107673 is a prime.

It is a super-2 number, since 2×61450369817² (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 (61450369837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27704198 + ... + 27706415.

It is an arithmetic number, because the mean of its divisors is an integer number (15376445385).

Almost surely, 2^61450369817 is an apocalyptic number.

It is an amenable number.

61450369817 is a deficient number, since it is larger than the sum of its proper divisors (55411723).

61450369817 is a wasteful number, since it uses less digits than its factorization.

61450369817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55411722.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 61450369817 in words is "sixty-one billion, four hundred fifty million, three hundred sixty-nine thousand, eight hundred seventeen".