6938706221551 has 32 divisors (see below), whose sum is σ = 8105893907328. Its totient is φ = 5880508354560.

The previous prime is 6938706221527. The next prime is 6938706221561. The reversal of 6938706221551 is 1551226078396.

It is a cyclic number.

It is not a de Polignac number, because 6938706221551 - 2²⁹ = 6938169350639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6938706221492 and 6938706221501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6938706221521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91505385 + ... + 91581181.

It is an arithmetic number, because the mean of its divisors is an integer number (253309184604).

Almost surely, 2^{6938706221551} is an apocalyptic number.

6938706221551 is a deficient number, since it is larger than the sum of its proper divisors (1167187685777).

6938706221551 is a wasteful number, since it uses less digits than its factorization.

6938706221551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85971.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 6938706221551 in words is "six trillion, nine hundred thirty-eight billion, seven hundred six million, two hundred twenty-one thousand, five hundred fifty-one".