63909471925 has 54 divisors (see below), whose sum is σ = 87944695398. Its totient is φ = 45797996160.

The previous prime is 63909471881. The next prime is 63909471931. The reversal of 63909471925 is 52917490936.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 4705822801 + 59203649124 = 68599^2 + 243318^2 .

It is not a de Polignac number, because 63909471925 - 2¹⁵ = 63909439157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 53 ways as a sum of consecutive naturals, for example, 168626386 + ... + 168626764.

Almost surely, 2^63909471925 is an apocalyptic number.

63909471925 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63909471925 is a deficient number, since it is larger than the sum of its proper divisors (24035223473).

63909471925 is an equidigital number, since it uses as much as digits as its factorization.

63909471925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 63909471925 in words is "sixty-three billion, nine hundred nine million, four hundred seventy-one thousand, nine hundred twenty-five".