19742501120869 has 2 divisors, whose sum is σ = 19742501120870. Its totient is φ = 19742501120868.

The previous prime is 19742501120863. The next prime is 19742501120887. The reversal of 19742501120869 is 96802110524791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17934699863844 + 1807801257025 = 4234938^2 + 1344545^2 .

It is a cyclic number.

It is not a de Polignac number, because 19742501120869 - 2²¹ = 19742499023717 is a prime.

It is a super-2 number, since 2×19742501120869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19742501120863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9871250560434 + 9871250560435.

It is an arithmetic number, because the mean of its divisors is an integer number (9871250560435).

Almost surely, 2^{19742501120869} is an apocalyptic number.

It is an amenable number.

19742501120869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19742501120869 is an equidigital number, since it uses as much as digits as its factorization.

19742501120869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 19742501120869 in words is "nineteen trillion, seven hundred forty-two billion, five hundred one million, one hundred twenty thousand, eight hundred sixty-nine".