53212220446661 has 4 divisors (see below), whose sum is σ = 53365569785472. Its totient is φ = 53058871107852.

The previous prime is 53212220446639. The next prime is 53212220446709. The reversal of 53212220446661 is 16664402221235.

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 a de Polignac number, because none of the positive numbers 2^k-53212220446661 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 (53212220446361) 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, 76674668885 + ... + 76674669578.

It is an arithmetic number, because the mean of its divisors is an integer number (13341392446368).

Almost surely, 2^{53212220446661} is an apocalyptic number.

It is an amenable number.

53212220446661 is a deficient number, since it is larger than the sum of its proper divisors (153349338811).

53212220446661 is a wasteful number, since it uses less digits than its factorization.

53212220446661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153349338810.

The product of its (nonzero) digits is 829440, while the sum is 44.

Adding to 53212220446661 its reverse (16664402221235), we get a palindrome (69876622667896).

The spelling of 53212220446661 in words is "fifty-three trillion, two hundred twelve billion, two hundred twenty million, four hundred forty-six thousand, six hundred sixty-one".