655566601551 has 4 divisors (see below), whose sum is σ = 874088802072. Its totient is φ = 437044401032.

The previous prime is 655566601523. The next prime is 655566601553. The reversal of 655566601551 is 155106665556.

655566601551 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 655566601551 - 2³¹ = 653419117903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 655566601494 and 655566601503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655566601553) 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, 109261100256 + ... + 109261100261.

It is an arithmetic number, because the mean of its divisors is an integer number (218522200518).

Almost surely, 2^655566601551 is an apocalyptic number.

655566601551 is a deficient number, since it is larger than the sum of its proper divisors (218522200521).

655566601551 is a wasteful number, since it uses less digits than its factorization.

655566601551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218522200520.

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 655566601551 in words is "six hundred fifty-five billion, five hundred sixty-six million, six hundred one thousand, five hundred fifty-one".