1617152477621 has 2 divisors, whose sum is σ = 1617152477622. Its totient is φ = 1617152477620.

The previous prime is 1617152477587. The next prime is 1617152477623. The reversal of 1617152477621 is 1267742517161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1505740051396 + 111412426225 = 1227086^2 + 333785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617152477621 - 2³⁰ = 1616078735797 is a prime.

Together with 1617152477623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1617152477621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1617152477623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808576238810 + 808576238811.

It is an arithmetic number, because the mean of its divisors is an integer number (808576238811).

Almost surely, 2^{1617152477621} is an apocalyptic number.

It is an amenable number.

1617152477621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617152477621 is an equidigital number, since it uses as much as digits as its factorization.

1617152477621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 50.

The spelling of 1617152477621 in words is "one trillion, six hundred seventeen billion, one hundred fifty-two million, four hundred seventy-seven thousand, six hundred twenty-one".