73256763581 has 6 divisors (see below), whose sum is σ = 73450436670. Its totient is φ = 73063118328.

The previous prime is 73256763563. The next prime is 73256763623. The reversal of 73256763581 is 18536765237.

It can be written as a sum of positive squares in only one way, i.e., 54424690681 + 18832072900 = 233291^2 + 137230^2 .

It is not a de Polignac number, because 73256763581 - 2³⁴ = 56076894397 is a prime.

It is a super-2 number, since 2×73256763581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (6350400) is a multiple of the sum of its prime divisors (14112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73256763551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5331386 + ... + 5345108.

It is an arithmetic number, because the mean of its divisors is an integer number (12241739445).

Almost surely, 2^73256763581 is an apocalyptic number.

It is an amenable number.

73256763581 is a deficient number, since it is larger than the sum of its proper divisors (193673089).

73256763581 is an frugal number, since it uses more digits than its factorization.

73256763581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27835 (or 14112 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 53.

The spelling of 73256763581 in words is "seventy-three billion, two hundred fifty-six million, seven hundred sixty-three thousand, five hundred eighty-one".