55963909890 has 144 divisors (see below), whose sum is σ = 169365710592. Its totient is φ = 12783935808.

The previous prime is 55963909877. The next prime is 55963909891. The reversal of 55963909890 is 9890936955.

55963909890 is a `hidden beast` number, since 5 + 596 + 39 + 0 + 9 + 8 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (55963909891) 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 71 ways as a sum of consecutive naturals, for example, 10347567 + ... + 10352973.

It is an arithmetic number, because the mean of its divisors is an integer number (1176150768).

Almost surely, 2^55963909890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55963909890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84682855296).

55963909890 is an abundant number, since it is smaller than the sum of its proper divisors (113401800702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55963909890 is a wasteful number, since it uses less digits than its factorization.

55963909890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7781 (or 7771 counting only the distinct ones).

The product of its (nonzero) digits is 23619600, while the sum is 63.

The spelling of 55963909890 in words is "fifty-five billion, nine hundred sixty-three million, nine hundred nine thousand, eight hundred ninety".