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21661465732429 is a prime number
BaseRepresentation
bin1001110110011011100111…
…11110000110010101001101
32211200211000210100201021111
410323031303332012111031
510314400140211414204
6114023050122532021
74363663212520015
oct473156376062515
984624023321244
1021661465732429
1169a1637768aa6
12251a179067011
13c1188a51b943
1454c5c5d40c45
152786e76e8d04
hex13b373f8654d

21661465732429 has 2 divisors, whose sum is σ = 21661465732430. Its totient is φ = 21661465732428.

The previous prime is 21661465732391. The next prime is 21661465732433. The reversal of 21661465732429 is 92423756416612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12220582682025 + 9440883050404 = 3495795^2 + 3072602^2 .

It is a cyclic number.

It is not a de Polignac number, because 21661465732429 - 223 = 21661457343821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21661165732429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10830732866214 + 10830732866215.

It is an arithmetic number, because the mean of its divisors is an integer number (10830732866215).

Almost surely, 221661465732429 is an apocalyptic number.

It is an amenable number.

21661465732429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21661465732429 is an equidigital number, since it uses as much as digits as its factorization.

21661465732429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 58.

The spelling of 21661465732429 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred twenty-nine".