73781345557 has 8 divisors (see below), whose sum is σ = 74773353600. Its totient is φ = 72790789344.

The previous prime is 73781345543. The next prime is 73781345581. The reversal of 73781345557 is 75554318737.

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 73781345557 - 2¹⁵ = 73781312789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73781345498 and 73781345507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73781345857) 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, 260443 + ... + 464104.

It is an arithmetic number, because the mean of its divisors is an integer number (9346669200).

Almost surely, 2^73781345557 is an apocalyptic number.

It is an amenable number.

73781345557 is a deficient number, since it is larger than the sum of its proper divisors (992008043).

73781345557 is a wasteful number, since it uses less digits than its factorization.

73781345557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725915.

The product of its digits is 12348000, while the sum is 55.

The spelling of 73781345557 in words is "seventy-three billion, seven hundred eighty-one million, three hundred forty-five thousand, five hundred fifty-seven".