7173637681 has 6 divisors (see below), whose sum is σ = 8344843890. Its totient is φ = 6148832256.

The previous prime is 7173637613. The next prime is 7173637687. The reversal of 7173637681 is 1867363717.

It can be written as a sum of positive squares in only one way, i.e., 6750101281 + 423536400 = 82159^2 + 20580^2 .

It is not a de Polignac number, because 7173637681 - 2³¹ = 5026154033 is a prime.

It is a super-2 number, since 2×7173637681² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 146400769 = 7173637681 / (7 + 1 + 7 + 3 + 6 + 3 + 7 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7173637687) 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, 73200336 + ... + 73200433.

It is an arithmetic number, because the mean of its divisors is an integer number (1390807315).

Almost surely, 2^7173637681 is an apocalyptic number.

It is an amenable number.

7173637681 is a deficient number, since it is larger than the sum of its proper divisors (1171206209).

7173637681 is a wasteful number, since it uses less digits than its factorization.

7173637681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146400783 (or 146400776 counting only the distinct ones).

The product of its digits is 889056, while the sum is 49.

The square root of 7173637681 is about 84697.3298339446. The cubic root of 7173637681 is about 1928.6191704382.

The spelling of 7173637681 in words is "seven billion, one hundred seventy-three million, six hundred thirty-seven thousand, six hundred eighty-one".