61505803551585 has 8 divisors (see below), whose sum is σ = 98409285682560. Its totient is φ = 32803095227504.

The previous prime is 61505803551581. The next prime is 61505803551713. The reversal of 61505803551585 is 58515530850516.

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 61505803551585 - 2² = 61505803551581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61505803551581) 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, 2050193451705 + ... + 2050193451734.

It is an arithmetic number, because the mean of its divisors is an integer number (12301160710320).

Almost surely, 2^{61505803551585} is an apocalyptic number.

It is an amenable number.

61505803551585 is a deficient number, since it is larger than the sum of its proper divisors (36903482130975).

61505803551585 is a wasteful number, since it uses less digits than its factorization.

61505803551585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4100386903447.

The product of its (nonzero) digits is 18000000, while the sum is 57.

The spelling of 61505803551585 in words is "sixty-one trillion, five hundred five billion, eight hundred three million, five hundred fifty-one thousand, five hundred eighty-five".