621303737340401 has 2 divisors, whose sum is σ = 621303737340402. Its totient is φ = 621303737340400.

The previous prime is 621303737340371. The next prime is 621303737340421. The reversal of 621303737340401 is 104043737303126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516471121452001 + 104832615888400 = 22726001^2 + 10238780^2 .

It is a cyclic number.

It is not a de Polignac number, because 621303737340401 - 2²² = 621303733146097 is a prime.

It is not a weakly prime, because it can be changed into another prime (621303737340421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310651868670200 + 310651868670201.

It is an arithmetic number, because the mean of its divisors is an integer number (310651868670201).

Almost surely, 2^{621303737340401} is an apocalyptic number.

It is an amenable number.

621303737340401 is a deficient number, since it is larger than the sum of its proper divisors (1).

621303737340401 is an equidigital number, since it uses as much as digits as its factorization.

621303737340401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 44.

The spelling of 621303737340401 in words is "six hundred twenty-one trillion, three hundred three billion, seven hundred thirty-seven million, three hundred forty thousand, four hundred one".