1055666057 has 4 divisors (see below), whose sum is σ = 1055734020. Its totient is φ = 1055598096.

The previous prime is 1055665987. The next prime is 1055666063. The reversal of 1055666057 is 7506665501.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7506665501 = 3389 ⋅2215009.

It can be written as a sum of positive squares in 2 ways, for example, as 617224336 + 438441721 = 24844^2 + 20939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055666057 - 2¹⁰ = 1055665033 is a prime.

It is a super-2 number, since 2×1055666057² = 2228861647803854498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1055666257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063 + ... + 45995.

It is an arithmetic number, because the mean of its divisors is an integer number (263933505).

Almost surely, 2^1055666057 is an apocalyptic number.

It is an amenable number.

1055666057 is a deficient number, since it is larger than the sum of its proper divisors (67963).

1055666057 is an equidigital number, since it uses as much as digits as its factorization.

1055666057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67962.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 1055666057 is about 32491.0150195404. The cubic root of 1055666057 is about 1018.2213192648.

The spelling of 1055666057 in words is "one billion, fifty-five million, six hundred sixty-six thousand, fifty-seven".