620401543549 has 2 divisors, whose sum is σ = 620401543550. Its totient is φ = 620401543548.

The previous prime is 620401543543. The next prime is 620401543579. The reversal of 620401543549 is 945345104026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608017860025 + 12383683524 = 779755^2 + 111282^2 .

It is a cyclic number.

It is not a de Polignac number, because 620401543549 - 2¹³ = 620401535357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620401543543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310200771774 + 310200771775.

It is an arithmetic number, because the mean of its divisors is an integer number (310200771775).

Almost surely, 2^620401543549 is an apocalyptic number.

It is an amenable number.

620401543549 is a deficient number, since it is larger than the sum of its proper divisors (1).

620401543549 is an equidigital number, since it uses as much as digits as its factorization.

620401543549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 620401543549 in words is "six hundred twenty billion, four hundred one million, five hundred forty-three thousand, five hundred forty-nine".