55345651521 has 4 divisors (see below), whose sum is σ = 73794202032. Its totient is φ = 36897101012.

The previous prime is 55345651511. The next prime is 55345651601. The reversal of 55345651521 is 12515654355.

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 55345651521 - 2¹⁰ = 55345650497 is a prime.

It is a super-2 number, since 2×55345651521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55345651511) 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, 9224275251 + ... + 9224275256.

It is an arithmetic number, because the mean of its divisors is an integer number (18448550508).

Almost surely, 2^55345651521 is an apocalyptic number.

It is an amenable number.

55345651521 is a deficient number, since it is larger than the sum of its proper divisors (18448550511).

55345651521 is a wasteful number, since it uses less digits than its factorization.

55345651521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18448550510.

The product of its digits is 450000, while the sum is 42.

The spelling of 55345651521 in words is "fifty-five billion, three hundred forty-five million, six hundred fifty-one thousand, five hundred twenty-one".