7473617561 has 4 divisors (see below), whose sum is σ = 7528169652. Its totient is φ = 7419065472.

The previous prime is 7473617509. The next prime is 7473617563. The reversal of 7473617561 is 1657163747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1657163747 = 331 ⋅5006537.

It can be written as a sum of positive squares in 2 ways, for example, as 6461105161 + 1012512400 = 80381^2 + 31820^2 .

It is a cyclic number.

It is not a de Polignac number, because 7473617561 - 2³⁰ = 6399875737 is a prime.

It is a super-3 number, since 3×7473617561³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7473617563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27275840 + ... + 27276113.

It is an arithmetic number, because the mean of its divisors is an integer number (1882042413).

Almost surely, 2^7473617561 is an apocalyptic number.

It is an amenable number.

7473617561 is a deficient number, since it is larger than the sum of its proper divisors (54552091).

7473617561 is a wasteful number, since it uses less digits than its factorization.

7473617561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54552090.

The product of its digits is 740880, while the sum is 47.

The square root of 7473617561 is about 86450.0871081111. The cubic root of 7473617561 is about 1955.1359294816.

The spelling of 7473617561 in words is "seven billion, four hundred seventy-three million, six hundred seventeen thousand, five hundred sixty-one".