55515360640 has 64 divisors (see below), whose sum is σ = 132943401360. Its totient is φ = 22168164352.

The previous prime is 55515360581. The next prime is 55515360647. The reversal of 55515360640 is 4606351555.

55515360640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×55515360640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55515360593 and 55515360602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55515360647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301794 + ... + 449566.

Almost surely, 2^55515360640 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 55515360640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66471700680).

55515360640 is an abundant number, since it is smaller than the sum of its proper divisors (77428040720).

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

55515360640 is a wasteful number, since it uses less digits than its factorization.

55515360640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148379 (or 148367 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 55515360640 in words is "fifty-five billion, five hundred fifteen million, three hundred sixty thousand, six hundred forty".