7138121573551 has 4 divisors (see below), whose sum is σ = 7138129416912. Its totient is φ = 7138113730192.

The previous prime is 7138121573543. The next prime is 7138121573573. The reversal of 7138121573551 is 1553751218317.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7138121573551 - 2³ = 7138121573543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7138121573495 and 7138121573504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138151573551) 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, 2345350 + ... + 4447123.

It is an arithmetic number, because the mean of its divisors is an integer number (1784532354228).

Almost surely, 2^{7138121573551} is an apocalyptic number.

7138121573551 is a deficient number, since it is larger than the sum of its proper divisors (7843361).

7138121573551 is a wasteful number, since it uses less digits than its factorization.

7138121573551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7843360.

The product of its digits is 882000, while the sum is 49.

The spelling of 7138121573551 in words is "seven trillion, one hundred thirty-eight billion, one hundred twenty-one million, five hundred seventy-three thousand, five hundred fifty-one".