15501400660 has 12 divisors (see below), whose sum is σ = 32552941428. Its totient is φ = 6200560256.

The previous prime is 15501400639. The next prime is 15501400669. The reversal of 15501400660 is 6600410551.

It can be written as a sum of positive squares in 2 ways, for example, as 5734427076 + 9766973584 = 75726^2 + 98828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15501400669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387534997 + ... + 387535036.

It is an arithmetic number, because the mean of its divisors is an integer number (2712745119).

Almost surely, 2^15501400660 is an apocalyptic number.

15501400660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15501400660 is an abundant number, since it is smaller than the sum of its proper divisors (17051540768).

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

15501400660 is a wasteful number, since it uses less digits than its factorization.

15501400660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775070042 (or 775070040 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 15501400660 in words is "fifteen billion, five hundred one million, four hundred thousand, six hundred sixty".