63908001621 has 32 divisors (see below), whose sum is σ = 101621157120. Its totient is φ = 39549814272.

The previous prime is 63908001617. The next prime is 63908001631. The reversal of 63908001621 is 12610080936.

63908001621 is a `hidden beast` number, since 639 + 0 + 8 + 0 + 0 + 16 + 2 + 1 = 666.

It is not a de Polignac number, because 63908001621 - 2² = 63908001617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63908001631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 920145 + ... + 987158.

It is an arithmetic number, because the mean of its divisors is an integer number (3175661160).

Almost surely, 2^63908001621 is an apocalyptic number.

It is an amenable number.

63908001621 is a deficient number, since it is larger than the sum of its proper divisors (37713155499).

63908001621 is a wasteful number, since it uses less digits than its factorization.

63908001621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907402 (or 1907396 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 63908001621 in words is "sixty-three billion, nine hundred eight million, one thousand, six hundred twenty-one".