1021660055 has 16 divisors (see below), whose sum is σ = 1323870240. Its totient is φ = 752416128.

The previous prime is 1021660051. The next prime is 1021660063. The reversal of 1021660055 is 5500661201.

It is a cyclic number.

It is not a de Polignac number, because 1021660055 - 2² = 1021660051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021660051) 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, 3176 + ... + 45314.

It is an arithmetic number, because the mean of its divisors is an integer number (82741890).

Almost surely, 2^1021660055 is an apocalyptic number.

1021660055 is a deficient number, since it is larger than the sum of its proper divisors (302210185).

1021660055 is a wasteful number, since it uses less digits than its factorization.

1021660055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42530.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1021660055 is about 31963.4174487022. The cubic root of 1021660055 is about 1007.1685080353.

The spelling of 1021660055 in words is "one billion, twenty-one million, six hundred sixty thousand, fifty-five".