7556400660 has 144 divisors (see below), whose sum is σ = 22621334400. Its totient is φ = 1882379520.

The previous prime is 7556400659. The next prime is 7556400661. The reversal of 7556400660 is 660046557.

It is an interprime number because it is at equal distance from previous prime (7556400659) and next prime (7556400661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7556400661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1669881 + ... + 1674399.

It is an arithmetic number, because the mean of its divisors is an integer number (157092600).

Almost surely, 2^7556400660 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 7556400660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11310667200).

7556400660 is an abundant number, since it is smaller than the sum of its proper divisors (15064933740).

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

7556400660 is a wasteful number, since it uses less digits than its factorization.

7556400660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622 (or 4589 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 7556400660 is about 86927.5598415140. The cubic root of 7556400660 is about 1962.3282636581.

The spelling of 7556400660 in words is "seven billion, five hundred fifty-six million, four hundred thousand, six hundred sixty".