6556012440 has 32 divisors (see below), whose sum is σ = 19668037680. Its totient is φ = 1748269952.

The previous prime is 6556012409. The next prime is 6556012459. The reversal of 6556012440 is 442106556.

It is a super-2 number, since 2×6556012440² = 85962598226869507200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27316599 + ... + 27316838.

Almost surely, 2^6556012440 is an apocalyptic number.

6556012440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6556012440 is an abundant number, since it is smaller than the sum of its proper divisors (13112025240).

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

6556012440 is a wasteful number, since it uses less digits than its factorization.

6556012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54633451 (or 54633447 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 6556012440 is about 80969.2067393525. The cubic root of 6556012440 is about 1871.6009472472.

Adding to 6556012440 its reverse (442106556), we get a palindrome (6998118996).

The spelling of 6556012440 in words is "six billion, five hundred fifty-six million, twelve thousand, four hundred forty".