556666263551 has 4 divisors (see below), whose sum is σ = 556669168512. Its totient is φ = 556663358592.

The previous prime is 556666263509. The next prime is 556666263553. The reversal of 556666263551 is 155362666655.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556666263551 is a prime.

It is a super-2 number, since 2×556666263551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556666263553) 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, 1143071 + ... + 1555616.

It is an arithmetic number, because the mean of its divisors is an integer number (139167292128).

Almost surely, 2^556666263551 is an apocalyptic number.

556666263551 is a deficient number, since it is larger than the sum of its proper divisors (2904961).

556666263551 is a wasteful number, since it uses less digits than its factorization.

556666263551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904960.

The product of its digits is 29160000, while the sum is 56.

The spelling of 556666263551 in words is "five hundred fifty-six billion, six hundred sixty-six million, two hundred sixty-three thousand, five hundred fifty-one".