1556506056501 has 32 divisors (see below), whose sum is σ = 2526846013440. Its totient is φ = 939106753200.

The previous prime is 1556506056461. The next prime is 1556506056529. The reversal of 1556506056501 is 1056506056551.

It is not a de Polignac number, because 1556506056501 - 2¹⁰ = 1556506055477 is a prime.

It is a super-2 number, since 2×1556506056501² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556506056551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11684355 + ... + 11816816.

It is an arithmetic number, because the mean of its divisors is an integer number (78963937920).

Almost surely, 2^{1556506056501} is an apocalyptic number.

1556506056501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1556506056501 is a deficient number, since it is larger than the sum of its proper divisors (970339956939).

1556506056501 is a wasteful number, since it uses less digits than its factorization.

1556506056501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23501414 (or 23501408 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 1556506056501 in words is "one trillion, five hundred fifty-six billion, five hundred six million, fifty-six thousand, five hundred one".