1021166455 has 16 divisors (see below), whose sum is σ = 1299482784. Its totient is φ = 767692800.

The previous prime is 1021166453. The next prime is 1021166491. The reversal of 1021166455 is 5546611201.

It is not a de Polignac number, because 1021166455 - 2¹ = 1021166453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021166453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48280 + ... + 66130.

It is an arithmetic number, because the mean of its divisors is an integer number (81217674).

Almost surely, 2^1021166455 is an apocalyptic number.

1021166455 is a deficient number, since it is larger than the sum of its proper divisors (278316329).

1021166455 is a wasteful number, since it uses less digits than its factorization.

1021166455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18546.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1021166455 is about 31955.6951888079. The cubic root of 1021166455 is about 1007.0062823660.

Adding to 1021166455 its reverse (5546611201), we get a palindrome (6567777656).

The spelling of 1021166455 in words is "one billion, twenty-one million, one hundred sixty-six thousand, four hundred fifty-five".