618416420621 has 2 divisors, whose sum is σ = 618416420622. Its totient is φ = 618416420620.

The previous prime is 618416420593. The next prime is 618416420627. The reversal of 618416420621 is 126024614816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516055456900 + 102360963721 = 718370^2 + 319939^2 .

It is a cyclic number.

It is not a de Polignac number, because 618416420621 - 2²² = 618412226317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618416420627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309208210310 + 309208210311.

It is an arithmetic number, because the mean of its divisors is an integer number (309208210311).

Almost surely, 2^618416420621 is an apocalyptic number.

It is an amenable number.

618416420621 is a deficient number, since it is larger than the sum of its proper divisors (1).

618416420621 is an equidigital number, since it uses as much as digits as its factorization.

618416420621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 618416420621 in words is "six hundred eighteen billion, four hundred sixteen million, four hundred twenty thousand, six hundred twenty-one".