245577308021 has 2 divisors, whose sum is σ = 245577308022. Its totient is φ = 245577308020.

The previous prime is 245577307979. The next prime is 245577308023. The reversal of 245577308021 is 120803775542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172345371025 + 73231936996 = 415145^2 + 270614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245577308021 is a prime.

It is a super-2 number, since 2×245577308021² (a number of 24 digits) contains 22 as substring.

Together with 245577308023, 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 (245577308023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122788654010 + 122788654011.

It is an arithmetic number, because the mean of its divisors is an integer number (122788654011).

Almost surely, 2^245577308021 is an apocalyptic number.

It is an amenable number.

245577308021 is a deficient number, since it is larger than the sum of its proper divisors (1).

245577308021 is an equidigital number, since it uses as much as digits as its factorization.

245577308021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 245577308021 in words is "two hundred forty-five billion, five hundred seventy-seven million, three hundred eight thousand, twenty-one".