63642505651 has 4 divisors (see below), whose sum is σ = 67386182472. Its totient is φ = 59898828832.

The previous prime is 63642505609. The next prime is 63642505687. The reversal of 63642505651 is 15650524636.

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 63642505651 - 2¹⁹ = 63641981363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63642505598 and 63642505607.

It is not an unprimeable number, because it can be changed into a prime (63642505351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871838385 + ... + 1871838418.

It is an arithmetic number, because the mean of its divisors is an integer number (16846545618).

Almost surely, 2^63642505651 is an apocalyptic number.

63642505651 is a deficient number, since it is larger than the sum of its proper divisors (3743676821).

63642505651 is a wasteful number, since it uses less digits than its factorization.

63642505651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743676820.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 63642505651 in words is "sixty-three billion, six hundred forty-two million, five hundred five thousand, six hundred fifty-one".