7421514311551 has 4 divisors (see below), whose sum is σ = 7470663413104. Its totient is φ = 7372365210000.

The previous prime is 7421514311447. The next prime is 7421514311683. The reversal of 7421514311551 is 1551134151247.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7421514311551 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 (7421514341551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24574550550 + ... + 24574550851.

It is an arithmetic number, because the mean of its divisors is an integer number (1867665853276).

Almost surely, 2^{7421514311551} is an apocalyptic number.

7421514311551 is a deficient number, since it is larger than the sum of its proper divisors (49149101553).

7421514311551 is a wasteful number, since it uses less digits than its factorization.

7421514311551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49149101552.

The product of its digits is 84000, while the sum is 40.

Adding to 7421514311551 its reverse (1551134151247), we get a palindrome (8972648462798).

The spelling of 7421514311551 in words is "seven trillion, four hundred twenty-one billion, five hundred fourteen million, three hundred eleven thousand, five hundred fifty-one".