55605277640 has 192 divisors, whose sum is σ = 144673076160. Its totient is φ = 19072765440.

The previous prime is 55605277631. The next prime is 55605277657. The reversal of 55605277640 is 4677250655.

55605277640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44951102 + ... + 44952338.

It is an arithmetic number, because the mean of its divisors is an integer number (753505605).

Almost surely, 2^55605277640 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 55605277640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72336538080).

55605277640 is an abundant number, since it is smaller than the sum of its proper divisors (89067798520).

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

55605277640 is a wasteful number, since it uses less digits than its factorization.

55605277640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 55605277640 in words is "fifty-five billion, six hundred five million, two hundred seventy-seven thousand, six hundred forty".