621142636351 has 2 divisors, whose sum is σ = 621142636352. Its totient is φ = 621142636350.

The previous prime is 621142636349. The next prime is 621142636379. The reversal of 621142636351 is 153636241126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621142636351 - 2¹ = 621142636349 is a prime.

Together with 621142636349, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621142636321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310571318175 + 310571318176.

It is an arithmetic number, because the mean of its divisors is an integer number (310571318176).

Almost surely, 2^621142636351 is an apocalyptic number.

621142636351 is a deficient number, since it is larger than the sum of its proper divisors (1).

621142636351 is an equidigital number, since it uses as much as digits as its factorization.

621142636351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 40.

Adding to 621142636351 its reverse (153636241126), we get a palindrome (774778877477).

The spelling of 621142636351 in words is "six hundred twenty-one billion, one hundred forty-two million, six hundred thirty-six thousand, three hundred fifty-one".