655121766 has 16 divisors (see below), whose sum is σ = 1411031664. Its totient is φ = 201575904.

The previous prime is 655121749. The next prime is 655121771. The reversal of 655121766 is 667121556.

655121766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×655121766³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4199421 + ... + 4199576.

It is an arithmetic number, because the mean of its divisors is an integer number (88189479).

Almost surely, 2^655121766 is an apocalyptic number.

655121766 is an abundant number, since it is smaller than the sum of its proper divisors (755909898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655121766 is a wasteful number, since it uses less digits than its factorization.

655121766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8399015.

The product of its digits is 75600, while the sum is 39.

The square root of 655121766 is about 25595.3465692497. The cubic root of 655121766 is about 868.5083728344.

It can be divided in two parts, 6 and 55121766, that multiplied together give a square (330730596 = 18186²).

The spelling of 655121766 in words is "six hundred fifty-five million, one hundred twenty-one thousand, seven hundred sixty-six".