1556535221201 has 8 divisors (see below), whose sum is σ = 1638477511680. Its totient is φ = 1474594869168.

The previous prime is 1556535221147. The next prime is 1556535221207. The reversal of 1556535221201 is 1021225356551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1556535221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1556535221207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339760 + ... + 2215406.

It is an arithmetic number, because the mean of its divisors is an integer number (204809688960).

Almost surely, 2^{1556535221201} is an apocalyptic number.

It is an amenable number.

1556535221201 is a deficient number, since it is larger than the sum of its proper divisors (81942290479).

1556535221201 is an equidigital number, since it uses as much as digits as its factorization.

1556535221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969223.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 1556535221201 in words is "one trillion, five hundred fifty-six billion, five hundred thirty-five million, two hundred twenty-one thousand, two hundred one".