61581145583 has 8 divisors (see below), whose sum is σ = 61851729600. Its totient is φ = 61310669728.

The previous prime is 61581145523. The next prime is 61581145603. The reversal of 61581145583 is 38554118516.

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 61581145583 - 2²² = 61576951279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61581145523) 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, 1244585 + ... + 1293117.

It is an arithmetic number, because the mean of its divisors is an integer number (7731466200).

Almost surely, 2^61581145583 is an apocalyptic number.

61581145583 is a deficient number, since it is larger than the sum of its proper divisors (270584017).

61581145583 is a wasteful number, since it uses less digits than its factorization.

61581145583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54081.

The product of its digits is 576000, while the sum is 47.

The spelling of 61581145583 in words is "sixty-one billion, five hundred eighty-one million, one hundred forty-five thousand, five hundred eighty-three".