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21661465732811 is a prime number
BaseRepresentation
bin1001110110011011100111…
…11110000110011011001011
32211200211000210100201210122
410323031303332012123023
510314400140211422221
6114023050122533455
74363663212521102
oct473156376063313
984624023321718
1021661465732811
1169a1637769313
12251a17906728b
13c1188a51bb78
1454c5c5d41039
152786e76e8eab
hex13b373f866cb

21661465732811 has 2 divisors, whose sum is σ = 21661465732812. Its totient is φ = 21661465732810.

The previous prime is 21661465732783. The next prime is 21661465732817. The reversal of 21661465732811 is 11823756416612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21661465732811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21661465732817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830732866405 + 10830732866406.

It is an arithmetic number, because the mean of its divisors is an integer number (10830732866406).

Almost surely, 221661465732811 is an apocalyptic number.

21661465732811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21661465732811 is an equidigital number, since it uses as much as digits as its factorization.

21661465732811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The spelling of 21661465732811 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, eight hundred eleven".