1566612062021 has 4 divisors (see below), whose sum is σ = 1568014580652. Its totient is φ = 1565209543392.

The previous prime is 1566612062009. The next prime is 1566612062033. The reversal of 1566612062021 is 1202602166651.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1566612062009) and next prime (1566612062033).

It can be written as a sum of positive squares in 2 ways, for example, as 233081356225 + 1333530705796 = 482785^2 + 1154786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566612062021 - 2³⁰ = 1565538320197 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 (1566612062221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701257640 + ... + 701259873.

It is an arithmetic number, because the mean of its divisors is an integer number (392003645163).

Almost surely, 2^{1566612062021} is an apocalyptic number.

It is an amenable number.

1566612062021 is a deficient number, since it is larger than the sum of its proper divisors (1402518631).

1566612062021 is a wasteful number, since it uses less digits than its factorization.

1566612062021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402518630.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 1566612062021 in words is "one trillion, five hundred sixty-six billion, six hundred twelve million, sixty-two thousand, twenty-one".