2173505657 has 2 divisors, whose sum is σ = 2173505658. Its totient is φ = 2173505656.

The previous prime is 2173505629. The next prime is 2173505693. The reversal of 2173505657 is 7565053712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2008742761 + 164762896 = 44819^2 + 12836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173505657 - 2¹⁴ = 2173489273 is a prime.

It is a super-2 number, since 2×2173505657² = 9448253682022003298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2173505617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086752828 + 1086752829.

It is an arithmetic number, because the mean of its divisors is an integer number (1086752829).

Almost surely, 2^2173505657 is an apocalyptic number.

It is an amenable number.

2173505657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173505657 is an equidigital number, since it uses as much as digits as its factorization.

2173505657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 220500, while the sum is 41.

The square root of 2173505657 is about 46620.8714740512. The cubic root of 2173505657 is about 1295.3493900811.

The spelling of 2173505657 in words is "two billion, one hundred seventy-three million, five hundred five thousand, six hundred fifty-seven".