1646090557 has 2 divisors, whose sum is σ = 1646090558. Its totient is φ = 1646090556.

The previous prime is 1646090527. The next prime is 1646090617. The reversal of 1646090557 is 7550906461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1516790916 + 129299641 = 38946^2 + 11371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646090557 is a prime.

It is a super-2 number, since 2×1646090557² = 5419228243689140498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646090527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823045278 + 823045279.

It is an arithmetic number, because the mean of its divisors is an integer number (823045279).

Almost surely, 2^1646090557 is an apocalyptic number.

It is an amenable number.

1646090557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646090557 is an equidigital number, since it uses as much as digits as its factorization.

1646090557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1646090557 is about 40572.0415680552. The cubic root of 1646090557 is about 1180.7317488013.

The spelling of 1646090557 in words is "one billion, six hundred forty-six million, ninety thousand, five hundred fifty-seven".