620242422521 has 8 divisors (see below), whose sum is σ = 624830648904. Its totient is φ = 615668739840.

The previous prime is 620242422517. The next prime is 620242422533. The reversal of 620242422521 is 125224242026.

It can be written as a sum of positive squares in 4 ways, for example, as 114557879296 + 505684543225 = 338464^2 + 711115^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620242422521 - 2² = 620242422517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620242422571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550310 + ... + 3720911.

It is an arithmetic number, because the mean of its divisors is an integer number (78103831113).

Almost surely, 2^620242422521 is an apocalyptic number.

It is an amenable number.

620242422521 is a deficient number, since it is larger than the sum of its proper divisors (4588226383).

620242422521 is a wasteful number, since it uses less digits than its factorization.

620242422521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7271851.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 620242422521 its reverse (125224242026), we get a palindrome (745466664547).

The spelling of 620242422521 in words is "six hundred twenty billion, two hundred forty-two million, four hundred twenty-two thousand, five hundred twenty-one".