63539274721 has 8 divisors (see below), whose sum is σ = 68444435304. Its totient is φ = 58636617600.

The previous prime is 63539274677. The next prime is 63539274727. The reversal of 63539274721 is 12747293536.

It can be written as a sum of positive squares in 4 ways, for example, as 18918627025 + 44620647696 = 137545^2 + 211236^2 .

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 63539274721 - 2¹⁹ = 63538750433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63539274727) 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, 572980 + ... + 674821.

It is an arithmetic number, because the mean of its divisors is an integer number (8555554413).

Almost surely, 2^63539274721 is an apocalyptic number.

It is an amenable number.

63539274721 is a deficient number, since it is larger than the sum of its proper divisors (4905160583).

63539274721 is a wasteful number, since it uses less digits than its factorization.

63539274721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251731.

The product of its digits is 1905120, while the sum is 49.

The spelling of 63539274721 in words is "sixty-three billion, five hundred thirty-nine million, two hundred seventy-four thousand, seven hundred twenty-one".