61851616605 has 40 divisors (see below), whose sum is σ = 111609129984. Its totient is φ = 32769036000.

The previous prime is 61851616597. The next prime is 61851616637. The reversal of 61851616605 is 50661615816.

61851616605 is a `hidden beast` number, since 6 + 18 + 5 + 16 + 16 + 605 = 666.

It is not a de Polignac number, because 61851616605 - 2³ = 61851616597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 444541 + ... + 566850.

Almost surely, 2^61851616605 is an apocalyptic number.

It is an amenable number.

61851616605 is a deficient number, since it is larger than the sum of its proper divisors (49757513379).

61851616605 is a wasteful number, since it uses less digits than its factorization.

61851616605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011559 (or 1011550 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 61851616605 in words is "sixty-one billion, eight hundred fifty-one million, six hundred sixteen thousand, six hundred five".