63654621145 has 4 divisors (see below), whose sum is σ = 76385545380. Its totient is φ = 50923696912.

The previous prime is 63654621139. The next prime is 63654621157. The reversal of 63654621145 is 54112645636.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39843353664 + 23811267481 = 199608^2 + 154309^2 .

It is a cyclic number.

It is not a de Polignac number, because 63654621145 - 2⁵ = 63654621113 is a prime.

It is a super-2 number, since 2×63654621145² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6365462110 + ... + 6365462119.

It is an arithmetic number, because the mean of its divisors is an integer number (19096386345).

Almost surely, 2^63654621145 is an apocalyptic number.

It is an amenable number.

63654621145 is a deficient number, since it is larger than the sum of its proper divisors (12730924235).

63654621145 is a wasteful number, since it uses less digits than its factorization.

63654621145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12730924234.

The product of its digits is 518400, while the sum is 43.

The spelling of 63654621145 in words is "sixty-three billion, six hundred fifty-four million, six hundred twenty-one thousand, one hundred forty-five".