617624081021 has 2 divisors, whose sum is σ = 617624081022. Its totient is φ = 617624081020.

The previous prime is 617624080979. The next prime is 617624081023. The reversal of 617624081021 is 120180426716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391037608900 + 226586472121 = 625330^2 + 476011^2 .

It is a cyclic number.

It is not a de Polignac number, because 617624081021 - 2¹⁰ = 617624079997 is a prime.

Together with 617624081023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617624081023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308812040510 + 308812040511.

It is an arithmetic number, because the mean of its divisors is an integer number (308812040511).

Almost surely, 2^617624081021 is an apocalyptic number.

It is an amenable number.

617624081021 is a deficient number, since it is larger than the sum of its proper divisors (1).

617624081021 is an equidigital number, since it uses as much as digits as its factorization.

617624081021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 617624081021 in words is "six hundred seventeen billion, six hundred twenty-four million, eighty-one thousand, twenty-one".