63740036721 has 8 divisors (see below), whose sum is σ = 84999581920. Its totient is φ = 42486924672.

The previous prime is 63740036713. The next prime is 63740036743. The reversal of 63740036721 is 12763004736.

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

It is not a de Polignac number, because 63740036721 - 2³ = 63740036713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63740036721.

It is not an unprimeable number, because it can be changed into a prime (63740038721) 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, 1585120 + ... + 1624833.

It is an arithmetic number, because the mean of its divisors is an integer number (10624947740).

Almost surely, 2^63740036721 is an apocalyptic number.

It is an amenable number.

63740036721 is a deficient number, since it is larger than the sum of its proper divisors (21259545199).

63740036721 is a wasteful number, since it uses less digits than its factorization.

63740036721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216575.

The product of its (nonzero) digits is 127008, while the sum is 39.

The spelling of 63740036721 in words is "sixty-three billion, seven hundred forty million, thirty-six thousand, seven hundred twenty-one".