1561616650500 has 96 divisors (see below), whose sum is σ = 4598522772480. Its totient is φ = 411752070400.

The previous prime is 1561616650463. The next prime is 1561616650523. The reversal of 1561616650500 is 50566161651.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5715252 + ... + 5982251.

It is an arithmetic number, because the mean of its divisors is an integer number (47901278880).

Almost surely, 2^{1561616650500} is an apocalyptic number.

1561616650500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561616650500 is an abundant number, since it is smaller than the sum of its proper divisors (3036906121980).

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

1561616650500 is a wasteful number, since it uses less digits than its factorization.

1561616650500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11697614 (or 11697602 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 1561616650500 in words is "one trillion, five hundred sixty-one billion, six hundred sixteen million, six hundred fifty thousand, five hundred".