1656233421011 has 4 divisors (see below), whose sum is σ = 1783635991872. Its totient is φ = 1528830850152.

The previous prime is 1656233420983. The next prime is 1656233421049. The reversal of 1656233421011 is 1101243326561.

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

It is a cyclic number.

It is not a de Polignac number, because 1656233421011 - 2¹⁴ = 1656233404627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656233421071) 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, 63701285411 + ... + 63701285436.

It is an arithmetic number, because the mean of its divisors is an integer number (445908997968).

Almost surely, 2^{1656233421011} is an apocalyptic number.

1656233421011 is a deficient number, since it is larger than the sum of its proper divisors (127402570861).

1656233421011 is a wasteful number, since it uses less digits than its factorization.

1656233421011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127402570860.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 1656233421011 its reverse (1101243326561), we get a palindrome (2757476747572).

The spelling of 1656233421011 in words is "one trillion, six hundred fifty-six billion, two hundred thirty-three million, four hundred twenty-one thousand, eleven".