56194145581 has 8 divisors (see below), whose sum is σ = 64428384384. Its totient is φ = 48011532720.

The previous prime is 56194145543. The next prime is 56194145663. The reversal of 56194145581 is 18554149165.

It is a happy number.

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 56194145581 - 2⁷ = 56194145453 is a prime.

It is a super-2 number, since 2×56194145581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56194145521) 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, 12904150 + ... + 12908503.

It is an arithmetic number, because the mean of its divisors is an integer number (8053548048).

Almost surely, 2^56194145581 is an apocalyptic number.

It is an amenable number.

56194145581 is a deficient number, since it is larger than the sum of its proper divisors (8234238803).

56194145581 is a wasteful number, since it uses less digits than its factorization.

56194145581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25812971.

The product of its digits is 864000, while the sum is 49.

The spelling of 56194145581 in words is "fifty-six billion, one hundred ninety-four million, one hundred forty-five thousand, five hundred eighty-one".