6557651987969 has 4 divisors (see below), whose sum is σ = 6562061977344. Its totient is φ = 6553241998596.

The previous prime is 6557651987903. The next prime is 6557651988031. The reversal of 6557651987969 is 9697891567556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6557651987969 - 2³² = 6553357020673 is a prime.

It is a super-2 number, since 2×6557651987969² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6557650987969) 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, 2204992457 + ... + 2204995430.

It is an arithmetic number, because the mean of its divisors is an integer number (1640515494336).

Almost surely, 2^{6557651987969} is an apocalyptic number.

It is an amenable number.

6557651987969 is a deficient number, since it is larger than the sum of its proper divisors (4409989375).

6557651987969 is a wasteful number, since it uses less digits than its factorization.

6557651987969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4409989374.

The product of its digits is 7715736000, while the sum is 83.

The spelling of 6557651987969 in words is "six trillion, five hundred fifty-seven billion, six hundred fifty-one million, nine hundred eighty-seven thousand, nine hundred sixty-nine".