63401615251 has 4 divisors (see below), whose sum is σ = 68278662592. Its totient is φ = 58524567912.

The previous prime is 63401615237. The next prime is 63401615269. The reversal of 63401615251 is 15251610436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63401615251 - 2⁹ = 63401614739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63401615551) 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, 2438523651 + ... + 2438523676.

It is an arithmetic number, because the mean of its divisors is an integer number (17069665648).

Almost surely, 2^63401615251 is an apocalyptic number.

63401615251 is a deficient number, since it is larger than the sum of its proper divisors (4877047341).

63401615251 is a wasteful number, since it uses less digits than its factorization.

63401615251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877047340.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 63401615251 in words is "sixty-three billion, four hundred one million, six hundred fifteen thousand, two hundred fifty-one".