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19438763911 = 743277233143
BaseRepresentation
bin10010000110101000…
…111111111110000111
31212011201110112001221
4102012220333332013
5304302310421121
612532520101211
71255465524040
oct220650777607
955151415057
1019438763911
118275748046
123926004807
131aaa332088
14d2594d8c7
1578b858b41
hex486a3ff87

19438763911 has 16 divisors (see below), whose sum is σ = 22814539264. Its totient is φ = 16215492384.

The previous prime is 19438763879. The next prime is 19438763933. The reversal of 19438763911 is 11936783491.

It is not a de Polignac number, because 19438763911 - 25 = 19438763879 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 (19438760911) 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, 33195 + ... + 199948.

It is an arithmetic number, because the mean of its divisors is an integer number (1425908704).

Almost surely, 219438763911 is an apocalyptic number.

19438763911 is a deficient number, since it is larger than the sum of its proper divisors (3375775353).

19438763911 is a wasteful number, since it uses less digits than its factorization.

19438763911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233470.

The product of its digits is 979776, while the sum is 52.

The spelling of 19438763911 in words is "nineteen billion, four hundred thirty-eight million, seven hundred sixty-three thousand, nine hundred eleven".

Divisors: 1 7 43 277 301 1939 11911 83377 233143 1632001 10025149 64580611 70176043 452064277 2776966273 19438763911