655790587906 has 4 divisors (see below), whose sum is σ = 983685881862. Its totient is φ = 327895293952.

The previous prime is 655790587871. The next prime is 655790587909. The reversal of 655790587906 is 609785097556.

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

It can be written as a sum of positive squares in only one way, i.e., 639774419881 + 16016168025 = 799859^2 + 126555^2 .

It is a super-2 number, since 2×655790587906² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (655790587909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163947646975 + ... + 163947646978.

Almost surely, 2^655790587906 is an apocalyptic number.

655790587906 is a deficient number, since it is larger than the sum of its proper divisors (327895293956).

655790587906 is a wasteful number, since it uses less digits than its factorization.

655790587906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327895293955.

The product of its (nonzero) digits is 142884000, while the sum is 67.

The spelling of 655790587906 in words is "six hundred fifty-five billion, seven hundred ninety million, five hundred eighty-seven thousand, nine hundred six".