653611551421 has 4 divisors (see below), whose sum is σ = 653651135200. Its totient is φ = 653571967644.

The previous prime is 653611551413. The next prime is 653611551431. The reversal of 653611551421 is 124155116356.

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 653611551421 - 2³ = 653611551413 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 (653611551401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19767111 + ... + 19800148.

It is an arithmetic number, because the mean of its divisors is an integer number (163412783800).

Almost surely, 2^653611551421 is an apocalyptic number.

It is an amenable number.

653611551421 is a deficient number, since it is larger than the sum of its proper divisors (39583779).

653611551421 is a wasteful number, since it uses less digits than its factorization.

653611551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39583778.

The product of its digits is 108000, while the sum is 40.

Adding to 653611551421 its reverse (124155116356), we get a palindrome (777766667777).

The spelling of 653611551421 in words is "six hundred fifty-three billion, six hundred eleven million, five hundred fifty-one thousand, four hundred twenty-one".