7479737681 has 8 divisors (see below), whose sum is σ = 8332864680. Its totient is φ = 6666291072.

The previous prime is 7479737663. The next prime is 7479737717. The reversal of 7479737681 is 1867379747.

It can be written as a sum of positive squares in 4 ways, for example, as 38950081 + 7440787600 = 6241^2 + 86260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7479737681 is a prime.

It is a super-2 number, since 2×7479737681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7479737681.

It is not an unprimeable number, because it can be changed into a prime (7479737611) 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, 9919700 + ... + 9920453.

It is an arithmetic number, because the mean of its divisors is an integer number (1041608085).

Almost surely, 2^7479737681 is an apocalyptic number.

It is an amenable number.

7479737681 is a deficient number, since it is larger than the sum of its proper divisors (853126999).

7479737681 is a wasteful number, since it uses less digits than its factorization.

7479737681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19840195.

The product of its digits is 12446784, while the sum is 59.

The square root of 7479737681 is about 86485.4767056296. The cubic root of 7479737681 is about 1955.6694685911.

The spelling of 7479737681 in words is "seven billion, four hundred seventy-nine million, seven hundred thirty-seven thousand, six hundred eighty-one".