655474796021 has 4 divisors (see below), whose sum is σ = 659496113952. Its totient is φ = 651453478092.

The previous prime is 655474795981. The next prime is 655474796047. The reversal of 655474796021 is 120697474556.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655474796021 - 2³⁸ = 380596889077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655474798021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010658721 + ... + 2010659046.

It is an arithmetic number, because the mean of its divisors is an integer number (164874028488).

Almost surely, 2^655474796021 is an apocalyptic number.

It is an amenable number.

655474796021 is a deficient number, since it is larger than the sum of its proper divisors (4021317931).

655474796021 is a wasteful number, since it uses less digits than its factorization.

655474796021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021317930.

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 655474796021 in words is "six hundred fifty-five billion, four hundred seventy-four million, seven hundred ninety-six thousand, twenty-one".