61726361005 has 4 divisors (see below), whose sum is σ = 74071633212. Its totient is φ = 49381088800.

The previous prime is 61726360991. The next prime is 61726361009. The reversal of 61726361005 is 50016362716.

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 9641079721 + 52085281284 = 98189^2 + 228222^2 .

It is not a de Polignac number, because 61726361005 - 2¹³ = 61726352813 is a prime.

It is a super-2 number, since 2×61726361005² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61726361009) 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, 6172636096 + ... + 6172636105.

It is an arithmetic number, because the mean of its divisors is an integer number (18517908303).

Almost surely, 2^61726361005 is an apocalyptic number.

It is an amenable number.

61726361005 is a deficient number, since it is larger than the sum of its proper divisors (12345272207).

61726361005 is a wasteful number, since it uses less digits than its factorization.

61726361005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12345272206.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 61726361005 in words is "sixty-one billion, seven hundred twenty-six million, three hundred sixty-one thousand, five".