351666868555 has 16 divisors (see below), whose sum is σ = 430535274624. Its totient is φ = 275657616000.

The previous prime is 351666868549. The next prime is 351666868561. The reversal of 351666868555 is 555868666153.

It is an interprime number because it is at equal distance from previous prime (351666868549) and next prime (351666868561).

It is a de Polignac number, because none of the positive numbers 2^k-351666868555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684504 + ... + 1082533.

It is an arithmetic number, because the mean of its divisors is an integer number (26908454664).

Almost surely, 2^351666868555 is an apocalyptic number.

351666868555 is a deficient number, since it is larger than the sum of its proper divisors (78868406069).

351666868555 is a wasteful number, since it uses less digits than its factorization.

351666868555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767846.

The product of its digits is 155520000, while the sum is 64.

It can be divided in two parts, 351666 and 868555, that added together give a palindrome (1220221).

The spelling of 351666868555 in words is "three hundred fifty-one billion, six hundred sixty-six million, eight hundred sixty-eight thousand, five hundred fifty-five".