55489926968 has 128 divisors (see below), whose sum is σ = 128563200000. Its totient is φ = 21923664768.

The previous prime is 55489926959. The next prime is 55489926977. The reversal of 55489926968 is 86962998455.

It is a Cunningham number, because it is equal to 235563²-1.

It is an interprime number because it is at equal distance from previous prime (55489926959) and next prime (55489926977).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8948333 + ... + 8954531.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400000).

Almost surely, 2^55489926968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55489926968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64281600000).

55489926968 is an abundant number, since it is smaller than the sum of its proper divisors (73073273032).

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

55489926968 is a wasteful number, since it uses less digits than its factorization.

55489926968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457 (or 6453 counting only the distinct ones).

The product of its digits is 335923200, while the sum is 71.

The spelling of 55489926968 in words is "fifty-five billion, four hundred eighty-nine million, nine hundred twenty-six thousand, nine hundred sixty-eight".