6557387216101 has 4 divisors (see below), whose sum is σ = 6557398229932. Its totient is φ = 6557376202272.

The previous prime is 6557387216077. The next prime is 6557387216167. The reversal of 6557387216101 is 1016127837556.

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 3015466980100 + 3541920236001 = 1736510^2 + 1881999^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557387216101 - 2¹⁹ = 6557386691813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557387216801) 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, 4559520 + ... + 5822713.

It is an arithmetic number, because the mean of its divisors is an integer number (1639349557483).

Almost surely, 2^{6557387216101} is an apocalyptic number.

It is an amenable number.

6557387216101 is a deficient number, since it is larger than the sum of its proper divisors (11013831).

6557387216101 is a wasteful number, since it uses less digits than its factorization.

6557387216101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11013830.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 6557387216101 in words is "six trillion, five hundred fifty-seven billion, three hundred eighty-seven million, two hundred sixteen thousand, one hundred one".