15661010055510 has 48 divisors (see below), whose sum is σ = 41011565933520. Its totient is φ = 4146224241600.

The previous prime is 15661010055503. The next prime is 15661010055521. The reversal of 15661010055510 is 1555001016651.

It is a happy number.

15661010055510 is a `hidden beast` number, since 15 + 6 + 610 + 10 + 0 + 5 + 5 + 5 + 10 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 625927141 + ... + 625952160.

It is an arithmetic number, because the mean of its divisors is an integer number (854407623615).

Almost surely, 2^{15661010055510} is an apocalyptic number.

15661010055510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15661010055510 is an abundant number, since it is smaller than the sum of its proper divisors (25350555878010).

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

15661010055510 is a wasteful number, since it uses less digits than its factorization.

15661010055510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251879453 (or 1251879450 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 15661010055510 in words is "fifteen trillion, six hundred sixty-one billion, ten million, fifty-five thousand, five hundred ten".