104556642521 has 4 divisors (see below), whose sum is σ = 104558375844. Its totient is φ = 104554909200.

The previous prime is 104556642503. The next prime is 104556642523. The reversal of 104556642521 is 125246655401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95814392521 + 8742250000 = 309539^2 + 93500^2 .

It is a cyclic number.

It is not a de Polignac number, because 104556642521 - 2¹⁸ = 104556380377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104556642523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772790 + ... + 897951.

It is an arithmetic number, because the mean of its divisors is an integer number (26139593961).

Almost surely, 2^104556642521 is an apocalyptic number.

It is an amenable number.

104556642521 is a deficient number, since it is larger than the sum of its proper divisors (1733323).

104556642521 is an equidigital number, since it uses as much as digits as its factorization.

104556642521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733322.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 104556642521 in words is "one hundred four billion, five hundred fifty-six million, six hundred forty-two thousand, five hundred twenty-one".