61642518209 has 8 divisors (see below), whose sum is σ = 61827375168. Its totient is φ = 61457888080.

The previous prime is 61642518191. The next prime is 61642518229. The reversal of 61642518209 is 90281524616.

61642518209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61642518209 - 2¹² = 61642514113 is a prime.

It is a super-2 number, since 2×61642518209² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61642518209.

It is not an unprimeable number, because it can be changed into a prime (61642518229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495644 + ... + 607410.

It is an arithmetic number, because the mean of its divisors is an integer number (7728421896).

Almost surely, 2^61642518209 is an apocalyptic number.

It is an amenable number.

61642518209 is a deficient number, since it is larger than the sum of its proper divisors (184856959).

61642518209 is a wasteful number, since it uses less digits than its factorization.

61642518209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113415.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 61642518209 in words is "sixty-one billion, six hundred forty-two million, five hundred eighteen thousand, two hundred nine".