61006105509 has 8 divisors (see below), whose sum is σ = 81345234432. Its totient is φ = 40668856800.

The previous prime is 61006105493. The next prime is 61006105541. The reversal of 61006105509 is 90550160016.

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

It is not a de Polignac number, because 61006105509 - 2⁴ = 61006105493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61006105509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61006105549) 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, 392517 + ... + 525434.

It is an arithmetic number, because the mean of its divisors is an integer number (10168154304).

Almost surely, 2^61006105509 is an apocalyptic number.

It is an amenable number.

61006105509 is a deficient number, since it is larger than the sum of its proper divisors (20339128923).

61006105509 is a wasteful number, since it uses less digits than its factorization.

61006105509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940107.

The product of its (nonzero) digits is 8100, while the sum is 33.

The spelling of 61006105509 in words is "sixty-one billion, six million, one hundred five thousand, five hundred nine".